simple-notes-sync/CHANGELOG.md

Changelog

All notable changes to Simple Notes Sync will be documented in this file.

The format is based on Keep a Changelog.

🌍 Languages: Deutsch · English

---

[1.8.0] - 2026-02-10

🚨 CRITICAL BUGFIX (Tag recreated)

R8/ProGuard Obfuscation Fix - Prevents Data Loss

• 🔧 CRITICAL: Fixed incorrect ProGuard class path for Note$Companion$NoteRaw
  • Original v1.8.0 had specific -keep rules that didn't match
  • R8 obfuscated all NoteRaw fields (id→a, title→b, ...)
  • Gson couldn't parse JSON anymore → ALL notes appeared lost
  • Reverted to safe broad rule: -keep class dev.dettmer.simplenotes.** { *; }
• 🛡️ Added safety-guards in detectServerDeletions()
  • Prevents mass deletion when serverNoteIds is empty (network errors)
  • Aborts if ALL local notes would be marked as deleted
• ✅ Notes were never actually lost (JSON files intact on disk + server)
• ✅ Downgrade to v1.7.2 restored all notes

⚠️ If you installed original v1.8.0: Your notes are safe! Just update.

🎉 Major: Widgets, Sorting & Advanced Sync

Complete widget system with interactive checklists, note sorting, and major sync improvements!

🆕 Homescreen Widgets

Full Jetpack Glance Widget Framework (539987f)

• 5 responsive size classes (SMALL, NARROW_MED, NARROW_TALL, WIDE_MED, WIDE_TALL)
• Interactive checklist checkboxes that sync immediately to server
• Material You dynamic colors with configurable background opacity (0-100%)
• Lock widget toggle to prevent accidental edits
• Read-only mode with permanent options bar for locked widgets
• Widget configuration activity with note selection and settings
• Auto-refresh after sync completion
• Tap content to open editor (unlocked) or show options (locked)
• Complete resource cleanup fixes for connection leaks

Widget State Management:

• NoteWidgetState keys for per-instance persistence via DataStore
• Five top-level ActionCallbacks (Toggle Checkbox, Lock, Options, Refresh, Config)
• Type-safe parameter passing with NoteWidgetActionKeys

📊 Note & Checklist Sorting

Note Sorting (96c819b)

• Sort by: Updated (newest/oldest), Created, Title (A-Z/Z-A), Type
• Persistent sort preferences (saved in SharedPreferences)
• Sort dialog in main screen with direction toggle
• Combined sortedNotes StateFlow in MainViewModel

Checklist Sorting (96c819b, 900dad7)

• Sort by: Manual, Alphabetical, Unchecked First, Checked Last
• Visual separator between unchecked/checked items with count display
• Auto-sort on item toggle and reordering
• Drag-only within same group (unchecked/checked)
• Smooth fade/slide animations for item transitions
• Unit tested with 9 test cases for sorting logic validation

🔄 Sync Improvements

Server Deletion Detection (40d7c83, bf7a74e)

• New DELETED_ON_SERVER sync status for multi-device scenarios
• Detects when notes are deleted on other clients
• Zero performance impact (uses existing PROPFIND data)
• Deletion count shown in sync banner: "3 synced · 2 deleted on server"
• Edited deleted notes automatically re-upload to server (status → PENDING)

Sync Status Legend (07607fc)

• Help button (?) in main screen TopAppBar
• Dialog explaining all 5 sync status icons with descriptions
• Only visible when sync is configured

Live Sync Progress UI (df37d2a)

• Real-time phase indicators: PREPARING, UPLOADING, DOWNLOADING, IMPORTING_MARKDOWN
• Upload progress shows x/y counter (known total)
• Download progress shows count (unknown total)
• Single unified SyncProgressBanner (replaces dual system)
• Auto-hide: COMPLETED (2s), ERROR (4s)
• No misleading counters when nothing to sync
• Silent auto-sync stays silent, errors always shown

Parallel Downloads (bdfc0bf)

• Configurable concurrent downloads (default: 3 simultaneous)
• Kotlin coroutines async/awaitAll pattern
• Individual download timeout handling
• Graceful sequential fallback on concurrent errors
• Optimized network utilization for faster sync

✨ UX Improvements

Checklist Enhancements:

• Overflow gradient for long text items (3462f93)
• Auto-expand on focus, collapse to 5 lines when unfocused
• Drag & Drop flicker fix with straddle-target-center detection (538a705)
• Adjacency filter prevents item jumps during fast drag
• Race-condition fix for scroll + move operations

Settings UI Polish:

• Smooth language switching without activity recreate (881c0fd)
• Grid view as default for new installations (6858446)
• Sync settings restructured into clear sections: Triggers & Performance (eaac5a0)
• Changelog link added to About screen (49810ff)

Post-Update Changelog Dialog (661d9e0)

• Shows localized changelog on first launch after update
• Material 3 ModalBottomSheet with slide-up animation
• Loads F-Droid changelogs via assets (single source of truth)
• One-time display per versionCode (stored in SharedPreferences)
• Clickable GitHub link for full changelog
• Dismissable via button or swipe gesture
• Test mode in Debug Settings with reset option

Backup Settings Improvements (3e946ed)

• New BackupProgressCard with LinearProgressIndicator
• 3-phase status system: In Progress → Completion → Clear
• Success status shown for 2s, errors for 3s
• Removed redundant toast messages
• Buttons stay visible and disabled during operations
• Exception logging for better error tracking

🐛 Bug Fixes

Widget Text Display (d045d4d)

• Fixed text notes showing only 3 lines in widgets
• Changed from paragraph-based to line-based rendering
• LazyColumn now properly scrolls through all content
• Empty lines preserved as 8dp spacers
• Preview limits increased: compact 100→120, full 200→300 chars

🔧 Code Quality

Detekt Cleanup (1da1a63)

• Resolved all 22 Detekt warnings
• Removed 7 unused imports
• Defined constants for 5 magic numbers
• Optimized state reads with derivedStateOf
• Build: 0 Lint errors + 0 Detekt warnings

📚 Documentation

• Complete implementation plans for all 23 v1.8.0 features
• Widget system architecture and state management docs
• Sorting logic unit tests with edge case coverage
• F-Droid changelogs (English + German)

---

[1.7.2] - 2026-02-04

🐛 Critical Bug Fixes

JSON/Markdown Timestamp Sync

Problem: External editors (Obsidian, Typora, VS Code, custom editors) update Markdown content but don't update YAML updated: timestamp, causing the Android app to skip changes.

Solution:

• Server file modification time (mtime) is now used as source of truth instead of YAML timestamp
• Content changes detected via hash comparison
• Notes marked as PENDING after Markdown import → JSON automatically re-uploaded on next sync
• Fixes sorting issues after external edits

SyncStatus on Server Always PENDING

Problem: All JSON files on server contained "syncStatus": "PENDING" even after successful sync, confusing external clients.

Solution:

• Status is now set to SYNCED before JSON serialization
• Server and local copies are now consistent
• External web/Tauri editors can correctly interpret sync state

Deletion Tracker Race Condition

Problem: Batch deletes could lose deletion records due to concurrent file access.

Solution:

• Mutex-based synchronization for deletion tracking
• New trackDeletionSafe() function prevents race conditions
• Guarantees zombie note prevention even with rapid deletes

ISO8601 Timezone Parsing

Problem: Markdown imports failed with timezone offsets like +01:00 or -05:00.

Solution:

• Multi-format ISO8601 parser with fallback chain
• Supports UTC (Z), timezone offsets (+01:00, +0100), and milliseconds
• Compatible with Obsidian, Typora, VS Code timestamps

⚡ Performance Improvements

E-Tag Batch Caching

• E-Tags are now written in single batch operation instead of N individual writes
• Performance gain: ~50-100ms per sync with multiple notes
• Reduced disk I/O operations

Memory Leak Prevention

• SafeSardineWrapper now implements Closeable for explicit resource cleanup
• HTTP connection pool is properly evicted after sync
• Prevents socket exhaustion during frequent syncs

🔧 Technical Details

• IMPL_001: kotlinx.coroutines.sync.Mutex for thread-safe deletion tracking
• IMPL_002: Pattern-based ISO8601 parser with 8 format variants
• IMPL_003: Connection pool eviction + dispatcher shutdown in close()
• IMPL_004: Batch SharedPreferences.Editor updates
• IMPL_014: Server mtime parameter in Note.fromMarkdown()
• IMPL_015: syncStatus set before toJson() call

📚 Documentation

• External Editor Specification for web/Tauri editor developers
• Detailed implementation documentation for all bugfixes

---

[1.7.1] - 2026-02-02

🐛 Critical Bug Fixes

Android 9 App Crash Fix (#15)

Problem: App crashed on Android 9 (API 28) when using WorkManager Expedited Work for background sync.

Root Cause: When setExpedited() is used in WorkManager, the CoroutineWorker must implement getForegroundInfo() to return a Foreground Service notification. On Android 9-11, WorkManager calls this method, but the default implementation throws IllegalStateException: Not implemented.

Solution: Implemented getForegroundInfo() in SyncWorker to return a proper ForegroundInfo with sync progress notification.

Details:

• Added ForegroundInfo with sync progress notification for Android 9-11
• Android 10+: Sets FOREGROUND_SERVICE_TYPE_DATA_SYNC for proper service typing
• Added Foreground Service permissions to AndroidManifest.xml
• Notification shows sync progress with indeterminate progress bar
• Thanks to @roughnecks for the detailed debugging!

VPN Compatibility Fix (#11)

• WiFi socket binding now correctly detects Wireguard VPN interfaces (tun*, wg*, -wg-)
• Traffic routes through VPN tunnel instead of bypassing it directly to WiFi
• Fixes "Connection timeout" when syncing to external servers via VPN

🔧 Technical Changes

• New SafeSardineWrapper class ensures proper HTTP connection cleanup
• Reduced unnecessary 401 authentication challenges with preemptive auth headers
• Added ProGuard rule to suppress harmless TextInclusionStrategy warnings on older Android versions
• VPN interface detection via NetworkInterface.getNetworkInterfaces() pattern matching
• Foreground Service detection and notification system for background sync tasks

🌍 Localization

• Fixed hardcoded German error messages - now uses string resources for proper localization
• Added German and English strings for sync progress notifications

---

[1.7.0] - 2026-01-26

🎉 Major: Grid View, WiFi-Only Sync & VPN Support

Pinterest-style grid, WiFi-only sync mode, and proper VPN support!

🎨 Grid Layout

• Pinterest-style staggered grid without gaps
• Consistent 12dp spacing between cards
• Scroll position preserved when returning from settings
• New unified NoteCardGrid with dynamic preview lines (3 small, 6 large)

📡 Sync Improvements

• WiFi-only sync toggle - Sync only when connected to WiFi
• VPN support - Sync works correctly when VPN is active (traffic routes through VPN)
• Server change detection - All notes reset to PENDING when server URL changes
• Faster server check - Socket timeout reduced from 2s to 1s
• "Sync already running" feedback - Shows snackbar when sync is in progress

🔒 Self-Signed SSL Support

• Documentation added - Guide for using self-signed certificates
• Uses Android's built-in CA trust store
• Works with ownCloud, Nextcloud, Synology, home servers

🔧 Technical

• NoteCardGrid component with dynamic maxLines
• Removed FullLine spans for gapless layout
• resetAllSyncStatusToPending() in NotesStorage
• VPN detection in getOrCacheWiFiAddress()

---

[1.6.1] - 2026-01-20

🧹 Code Quality & Build Improvements

• detekt: 0 issues - All 29 code quality issues resolved

  • Trivial fixes: Unused imports, MaxLineLength
  • File rename: DragDropState.kt → DragDropListState.kt
  • MagicNumbers → Constants (Dimensions.kt, SyncConstants.kt)
  • SwallowedException: Logger.w() added for better error tracking
  • LongParameterList: ChecklistEditorCallbacks data class created
  • LongMethod: ServerSettingsScreen split into components
  • @Suppress annotations for legacy code (WebDavSyncService, SettingsActivity)

• Zero build warnings - All 21 deprecation warnings eliminated

  • File-level @Suppress for deprecated imports
  • ProgressDialog, LocalBroadcastManager, AbstractSavedStateViewModelFactory
  • onActivityResult, onRequestPermissionsResult
  • Gradle Compose config cleaned up (StrongSkipping is now default)

• ktlint reactivated - Linting re-enabled with Compose-specific rules

  • .editorconfig created with Compose formatting rules
  • Legacy files excluded: WebDavSyncService.kt, build.gradle.kts
  • ignoreFailures=true for gradual migration

• CI/CD improvements - GitHub Actions lint checks integrated

  • detekt + ktlint + Android Lint run before build in pr-build-check.yml
  • Ensures code quality on every pull request

🔧 Technical Improvements

• Constants refactoring - Better code organization

  • ui/theme/Dimensions.kt: UI-related constants
  • utils/SyncConstants.kt: Sync operation constants

• Preparation for v2.0.0 - Legacy code marked for removal

  • SettingsActivity and MainActivity (replaced by Compose versions)
  • All deprecated APIs documented with removal plan

---

[1.6.0] - 2026-01-19

🎉 Major: Configurable Sync Triggers

Fine-grained control over when your notes sync - choose which triggers fit your workflow best!

⚙️ Sync Trigger System

• Individual trigger control - Enable/disable each sync trigger separately in settings

• 5 Independent Triggers:

  • onSave Sync - Sync immediately after saving a note (5s throttle)
  • onResume Sync - Sync when app is opened (60s throttle)
  • WiFi-Connect Sync - Sync when WiFi is connected
  • Periodic Sync - Background sync every 15/30/60 minutes (configurable)
  • Boot Sync - Start background sync after device restart

• Smart Defaults - Only event-driven triggers active by default (onSave, onResume, WiFi-Connect)

• Battery Optimized - ~0.2%/day with defaults, up to ~1.0% with periodic sync enabled

• Offline Mode UI - Grayed-out sync toggles when no server configured

• Dynamic Settings Subtitle - Shows count of active triggers on main settings screen

🔧 Server Configuration Improvements

• Offline Mode Toggle - Disable all network features with one switch
• Split Protocol & Host - Protocol (http/https) shown as non-editable prefix
• Clickable Settings Cards - Full card clickable for better UX
• Clickable Toggle Rows - Click text/icon to toggle switches (not just the switch itself)

🐛 Bug Fixes

• Fixed: Missing 5th sync trigger (Boot) in main settings screen subtitle count
• Various fixes - UI improvements and stability enhancements

🔧 Technical Improvements

• Reactive offline mode state - StateFlow ensures UI updates correctly
• Separated server config checks - hasServerConfig() vs isServerConfigured() (offline-aware)
• Improved constants - All sync trigger keys and defaults in Constants.kt
• Better code organization - Settings screens refactored for clarity

Looking Ahead

🚀 v1.7.0 will bring server folder checking and additional community features. Feature requests welcome as GitHub Issue.

---

[1.5.0] - 2026-01-15

🎉 Major: Jetpack Compose UI Redesign

The complete UI has been migrated from XML Views to Jetpack Compose. The app is now more modern, faster, and smoother.

🌍 New Feature: Internationalization (i18n)

• English language support - All 400+ strings translated
• Automatic language detection - Follows system language
• Manual language selection - Switchable in settings
• Per-App Language (Android 13+) - Native language setting via system settings
• locales_config.xml - Complete Android integration

⚙️ Modernized Settings

• 7 categorized settings screens - Clearer and more intuitive
• Compose Navigation - Smooth transitions between screens
• Consistent design - Material Design 3 throughout

✨ UI Improvements

• Selection Mode - Long-press for multi-select instead of swipe-to-delete
• Batch Delete - Delete multiple notes at once
• Silent-Sync Mode - No banner during auto-sync (only for manual sync)
• App Icon in About Screen - High-quality display
• App Icon in Empty State - Instead of emoji when note list is empty
• Splash Screen Update - Uses app foreground icon
• Slide Animations - Smooth animations in NoteEditor

🔧 Technical Improvements

• Jetpack Compose - Complete UI migration
• Compose ViewModel Integration - StateFlow for reactive UI
• Improved Code Quality - Detekt/Lint warnings fixed
• Unused Imports Cleanup - Cleaner codebase

Looking Ahead

🚀 v1.6.0 will bring server folder checking and further technical modernizations. Feature requests welcome as GitHub Issue.

---

[1.4.1] - 2026-01-11

Fixed

• 🗑️ Deleting older notes (v1.2.0 compatibility)

  • Notes from app version v1.2.0 or earlier are now correctly deleted from the server
  • Fixes issue with multi-device usage with older notes

• 🔄 Checklist sync backward compatibility

  • Checklists now also saved as text fallback in the content field
  • Older app versions (v1.3.x) display checklists as readable text
  • Format: GitHub-style task lists ([ ] Item / [x] Item)
  • Recovery mode: If checklist items are lost, they are recovered from content

Improved

• 📝 Checklist auto line-wrap
  • Long checklist texts now automatically wrap
  • No more limit to 3 lines
  • Enter key still creates a new item

Looking Ahead

🚀 v1.5.0 will be the next major release. We're collecting ideas and feedback! Feature requests welcome as GitHub Issue.

---

[1.4.0] - 2026-01-10

🎉 New Feature: Checklists

• ✅ Checklist Notes

  • New note type: Checklists with tap-to-toggle items
  • Add items via dedicated input field with "+" button
  • Drag & drop reordering (long-press to activate)
  • Swipe-to-delete items
  • Visual distinction: Checked items get strikethrough styling
  • Type selector when creating new notes (Text or Checklist)

• 📝 Markdown Integration

  • Checklists export as GitHub-style task lists (- [ ] / - [x])
  • Compatible with Obsidian, Notion, and other Markdown editors
  • Full round-trip: Edit in Obsidian → Sync back to app
  • YAML frontmatter includes type: checklist for identification

Fixed

• <EFBFBD> Markdown Parsing Robustness

  • Fixed content extraction after title (was returning empty for some formats)
  • Now handles single newline after title (was requiring double newline)
  • Protection: Skips import if parsed content is empty but local has content

• 📂 Duplicate Filename Handling

  • Notes with identical titles now get unique Markdown filenames
  • Format: title_shortid.md (e.g., test_71540ca9.md)
  • Prevents data loss from filename collisions

• 🔔 Notification UX

  • No sync notifications when app is in foreground
  • User sees changes directly in UI - no redundant notification
  • Background syncs still show notifications as expected

Privacy Improvements

• 🔒 WiFi Permissions Removed
  • Removed ACCESS_WIFI_STATE permission
  • Removed CHANGE_WIFI_STATE permission
  • WiFi binding now works via IP detection instead of SSID matching
  • Cleaned up all SSID-related code from codebase and documentation

Technical Improvements

• 📦 New Data Model

  • NoteType enum: TEXT, CHECKLIST
  • ChecklistItem data class with id, text, isChecked, order
  • Note.kt extended with noteType and checklistItems fields

• 🔄 Sync Protocol v1.4.0

  • JSON format updated to include checklist fields
  • Full backward compatibility with v1.3.x notes
  • Robust JSON parsing with manual field extraction

---

[1.3.2] - 2026-01-10

Changed

• 🧹 Code-Qualität: "Clean Slate" Release
  • Alle einfachen Lint-Issues behoben (Phase 1-7 des Cleanup-Plans)
  • Unused Imports und Members entfernt
  • Magic Numbers durch benannte Konstanten ersetzt
  • SwallowedExceptions mit Logger.w() versehen
  • MaxLineLength-Verstöße reformatiert
  • ConstructorParameterNaming (snake_case → camelCase mit @SerializedName)
  • Custom Exceptions: SyncException.kt und ValidationException.kt erstellt

Added

• 📝 F-Droid Privacy Notice
  • Datenschutz-Hinweis für die Datei-Logging-Funktion
  • Erklärt dass Logs nur lokal gespeichert werden
  • Erfüllt F-Droid Opt-in Consent-Anforderungen

Technical Improvements

• ⚡ Neue Konstanten für bessere Wartbarkeit

  • SYNC_COMPLETED_DELAY_MS, ERROR_DISPLAY_DELAY_MS (MainActivity)
  • CONNECTION_TIMEOUT_MS (SettingsActivity)
  • SOCKET_TIMEOUT_MS, MAX_FILENAME_LENGTH, ETAG_PREVIEW_LENGTH (WebDavSyncService)
  • AUTO_CANCEL_TIMEOUT_MS (NotificationHelper)
  • RFC 1918 IP-Range Konstanten (UrlValidator)
  • DAYS_THRESHOLD, TRUNCATE_SUFFIX_LENGTH (Extensions)

• 🔒 @Suppress Annotations für legitime Patterns

  • ReturnCount: Frühe Returns für Validierung sind idiomatisch
  • LoopWithTooManyJumpStatements: Komplexe Sync-Logik dokumentiert

Notes

• Komplexe Refactorings (LargeClass, LongMethod) für v1.3.3+ geplant
• Deprecation-Warnungen (LocalBroadcastManager, ProgressDialog) bleiben bestehen

---

[1.3.1] - 2026-01-08

Fixed

• 🔧 Multi-Device JSON Sync (Danke an Thomas aus Bielefeld)
  • JSON-Dateien werden jetzt korrekt zwischen Geräten synchronisiert
  • Funktioniert auch ohne aktiviertes Markdown
  • Hybrid-Optimierung: Server-Timestamp (Primary) + E-Tag (Secondary) Checks
  • E-Tag wird nach Upload gecached um Re-Download zu vermeiden

Performance Improvements

• ⚡ JSON Sync Performance-Parität

  • JSON-Sync erreicht jetzt gleiche Performance wie Markdown (~2-3 Sekunden)
  • Timestamp-basierte Skip-Logik für unveränderte Dateien (~500ms pro Datei gespart)
  • E-Tag-Matching als Fallback für Dateien die seit letztem Sync modifiziert wurden
  • Beispiel: 24 Dateien von 12-14s auf ~2.7s reduziert (keine Änderungen)

• ⏭️ Skip unveränderte Dateien (Haupt-Performance-Fix!)

  • JSON-Dateien: Überspringt alle Notizen, die seit letztem Sync nicht geändert wurden
  • Markdown-Dateien: Überspringt unveränderte MD-Dateien basierend auf Server-Timestamp
  • Spart ~500ms pro Datei bei Nextcloud (~20 Dateien = 10 Sekunden gespart!)
  • Von 21 Sekunden Sync-Zeit auf 2-3 Sekunden reduziert

• ⚡ Session-Caching für WebDAV

  • Sardine-Client wird pro Sync-Session wiederverwendet (~600ms gespart)
  • WiFi-IP-Adresse wird gecacht statt bei jeder Anfrage neu ermittelt (~300ms gespart)
  • /notes/ Ordner-Existenz wird nur einmal pro Sync geprüft (~500ms gespart)
  • Gesamt: ~1.4 Sekunden zusätzlich gespart

• 📝 Content-basierte Markdown-Erkennung

  • Extern bearbeitete Markdown-Dateien werden auch erkannt wenn YAML-Timestamp nicht aktualisiert wurde
  • Löst das Problem: Obsidian/Texteditor-Änderungen wurden nicht importiert
  • Hybridansatz: Erst Timestamp-Check (schnell), dann Content-Vergleich (zuverlässig)

Added

• 🔄 Sync-Status-Anzeige (UI)
  • Sichtbares Banner "Synchronisiere..." mit ProgressBar während Sync läuft
  • Sync-Button und Pull-to-Refresh werden deaktiviert während Sync aktiv
  • Verhindert versehentliche Doppel-Syncs durch visuelle Rückmeldung
  • Auch in Einstellungen: "Jetzt synchronisieren" Button wird deaktiviert

Fixed

• 🔧 Sync-Mutex verhindert doppelte Syncs

  • Keine doppelten Toast-Nachrichten mehr bei schnellem Pull-to-Refresh
  • Concurrent Sync-Requests werden korrekt blockiert

• 🐛 Lint-Fehler behoben

  • View.generateViewId() statt hardcodierte IDs in RadioButtons
  • app:tint statt android:tint für AppCompat-Kompatibilität

Added

• 🔍 detekt Code-Analyse

  • Statische Code-Analyse mit detekt 1.23.4 integriert
  • Pragmatische Konfiguration für Sync-intensive Codebasis
  • 91 Issues identifiziert (als Baseline für v1.4.0)

• 🏗️ Debug Build mit separatem Package

  • Debug-APK kann parallel zur Release-Version installiert werden
  • Package: dev.dettmer.simplenotes.debug (Debug) vs dev.dettmer.simplenotes (Release)
  • App-Name zeigt "Simple Notes (Debug)" für einfache Unterscheidung

• 📊 Debug-Logging UI

  • Neuer "Debug Log" Button in Einstellungen → Erweitert
  • Zeigt letzte Sync-Logs mit Zeitstempeln
  • Export-Funktion für Fehlerberichte

Technical

• WebDavSyncService: Hybrid-Optimierung für JSON-Downloads (Timestamp PRIMARY, E-Tag SECONDARY)
• WebDavSyncService: E-Tag refresh nach Upload statt Invalidierung (verhindert Re-Download)
• E-Tag Caching: SharedPreferences mit Key-Pattern etag_json_{noteId}
• Skip-Logik: if (serverModified <= lastSync) skip → ~1ms pro Datei
• Fallback E-Tag: if (serverETag == cachedETag) skip → für Dateien modifiziert nach lastSync
• PROPFIND nach PUT: Fetch E-Tag nach Upload für korrektes Caching
• SyncStateManager: Neuer Singleton mit StateFlow<Boolean> für Sync-Status
• MainActivity: Observer auf SyncStateManager.isSyncing für UI-Updates
• Layout: sync_status_banner mit ProgressBar + TextView
• WebDavSyncService: Skip-Logik für unveränderte JSON/MD Dateien basierend auf lastSyncTimestamp
• WebDavSyncService: Neue Session-Cache-Variablen (sessionSardine, sessionWifiAddress, notesDirEnsured)
• getOrCreateSardine(): Cached Sardine-Client mit automatischer Credentials-Konfiguration
• getOrCacheWiFiAddress(): WiFi-Adresse wird nur einmal pro Sync ermittelt
• clearSessionCache(): Aufräumen am Ende jeder Sync-Session
• ensureNotesDirectoryExists(): Cached Directory-Check
• Content-basierter Import: Vergleicht MD-Content mit lokaler Note wenn Timestamps gleich
• Build-Tooling: detekt aktiviert, ktlint vorbereitet (deaktiviert wegen Parser-Problemen)
• Debug BuildType: applicationIdSuffix = ".debug", versionNameSuffix = "-debug"

---

[1.3.0] - 2026-01-07

Added

• 🚀 Multi-Device Sync (Thanks to Thomas from Bielefeld for reporting!)

  • Automatic download of new notes from other devices
  • Deletion tracking prevents "zombie notes" (deleted notes don't come back)
  • Smart cleanup: Re-created notes (newer timestamp) are downloaded
  • Works with all devices: v1.2.0, v1.2.1, v1.2.2, and v1.3.0

• 🗑️ Server Deletion via Swipe Gesture

  • Swipe left on notes to delete from server (requires confirmation)
  • Prevents duplicate notes on other devices
  • Works with deletion tracking system
  • Material Design confirmation dialog

• ⚡ E-Tag Performance Optimization

  • Smart server checking with E-Tag caching (~150ms vs 3000ms for "no changes")
  • 20x faster when server has no updates
  • E-Tag hybrid approach: E-Tag for JSON (fast), timestamp for Markdown (reliable)
  • Battery-friendly with minimal server requests

• 📥 Markdown Auto-Sync Toggle

  • NEW: Unified Auto-Sync toggle in Settings (replaces separate Export/Auto-Import toggles)
  • When enabled: Notes export to Markdown AND import changes automatically
  • When disabled: Manual sync button appears for on-demand synchronization
  • Performance: Auto-Sync OFF = 0ms overhead

• 🔘 Manual Markdown Sync Button

  • Manual sync button for performance-conscious users
  • Shows import/export counts after completion
  • Only visible when Auto-Sync is disabled
  • On-demand synchronization (~150-200ms only when triggered)

• ⚙️ Server-Restore Modes

  • MERGE: Keep local notes + add server notes
  • REPLACE: Delete all local + download from server
  • OVERWRITE: Update duplicates, keep non-duplicates
  • Restore modes now work correctly for WebDAV restore

Technical

• New DeletionTracker model with JSON persistence
• NotesStorage: Added deletion tracking methods
• WebDavSyncService.hasUnsyncedChanges(): Intelligent server checks with E-Tag caching
• WebDavSyncService.downloadRemoteNotes(): Deletion-aware downloads
• WebDavSyncService.restoreFromServer(): Support for restore modes
• WebDavSyncService.deleteNoteFromServer(): Server deletion with YAML frontmatter scanning
• WebDavSyncService.importMarkdownFiles(): Automatic Markdown import during sync
• WebDavSyncService.manualMarkdownSync(): Manual sync with result counts
• MainActivity.setupSwipeToDelete(): Two-stage swipe deletion with confirmation
• E-Tag caching in SharedPreferences for performance

---

[1.2.2] - 2026-01-06

Fixed

• Backward Compatibility for v1.2.0 Users (Critical)
  • App now reads BOTH old (Root) AND new (/notes/) folder structures
  • Users upgrading from v1.2.0 no longer lose their existing notes
  • Server-Restore now finds notes from v1.2.0 stored in Root folder
  • Automatic deduplication prevents loading the same note twice
  • Graceful error handling if Root folder is not accessible

Technical

• WebDavSyncService.downloadRemoteNotes() - Dual-mode download (Root + /notes/)
• WebDavSyncService.restoreFromServer() - Now uses dual-mode download
• Migration happens naturally: new uploads go to /notes/, old notes stay readable

---

[1.2.1] - 2026-01-05

Fixed

• Markdown Initial Export Bugfix

  • Existing notes are now exported as Markdown when Desktop Integration is activated
  • Previously, only new notes created after activation were exported
  • Progress dialog shows export status with current/total counter
  • Error handling for network issues during export
  • Individual note failures don't abort the entire export

• Markdown Directory Structure Fix

  • Markdown files now correctly land in /notes-md/ folder
  • Smart URL detection supports both Root-URL and /notes URL structures
  • Previously, MD files were incorrectly placed in the root directory
  • Markdown import now finds files correctly

• JSON URL Normalization

  • Simplified server configuration: enter only base URL (e.g., http://server:8080/)
  • App automatically creates /notes/ for JSON files and /notes-md/ for Markdown
  • Smart detection: both http://server:8080/ and http://server:8080/notes/ work correctly
  • Backward compatible: existing setups with /notes in URL continue to work
  • No migration required for existing users

Changed

• Markdown Directory Creation

  • notes-md/ folder is now created on first sync (regardless of Desktop Integration setting)
  • Prevents 404 errors when mounting WebDAV folder
  • Better user experience: folder is visible before enabling the feature

• Settings UI Improvements

  • Updated example URL from /webdav to /notes to match app behavior
  • Example now shows: http://192.168.0.188:8080/notes

Technical

• WebDavSyncService.ensureMarkdownDirectoryExists() - Creates MD folder early
• WebDavSyncService.getMarkdownUrl() - Smart URL detection for both structures
• WebDavSyncService.exportAllNotesToMarkdown() - Exports all local notes with progress callback
• SettingsActivity.onMarkdownExportToggled() - Triggers initial export with ProgressDialog

---

1.2.0 - 2026-01-04

Added

• Local Backup System

  • Export all notes as JSON file to any location (Downloads, SD card, cloud folder)
  • Import backup with 3 modes: Merge, Replace, or Overwrite duplicates
  • Automatic safety backup created before every restore
  • Backup validation (format and version check)

• Markdown Desktop Integration

  • Optional Markdown export parallel to JSON sync
  • .md files synced to notes-md/ folder on WebDAV
  • YAML frontmatter with id, created, updated, device
  • Manual import button to pull Markdown changes from server
  • Last-Write-Wins conflict resolution via timestamps

• Settings UI Extensions

  • New "Backup & Restore" section with local + server restore
  • New "Desktop Integration" section with Markdown toggle
  • Universal restore dialog with radio button mode selection

Changed

• Server Restore Behavior: Users now choose restore mode (Merge/Replace/Overwrite) instead of hard-coded replace-all

Technical

• BackupManager.kt - Complete backup/restore logic
• Note.toMarkdown() / Note.fromMarkdown() - Markdown conversion with YAML frontmatter
• WebDavSyncService - Extended for dual-format sync (JSON master + Markdown mirror)
• ISO8601 timestamp formatting for desktop compatibility
• Filename sanitization for safe Markdown file names

Documentation

• Added WebDAV mount instructions (Windows, macOS, Linux)
• Complete sync architecture documentation
• Desktop integration analysis

---

1.1.2 - 2025-12-28

Fixed

• "Job was cancelled" Error

  • Fixed coroutine cancellation in sync worker
  • Proper error handling for interrupted syncs

• UI Improvements

  • Back arrow instead of X in note editor (better UX)
  • Pull-to-refresh for manual sync trigger
  • HTTP/HTTPS protocol selection with radio buttons
  • Inline error display (no toast spam)

• Performance & Battery

  • Sync only on actual changes (saves battery)
  • Auto-save notifications removed
  • 24-hour server offline warning instead of instant error

Changed

• Settings grouped into "Auto-Sync" and "Sync Interval" sections
• HTTP only allowed for local networks (RFC 1918 IPs)
• Swipe-to-delete without UI flicker

---

1.1.1 - 2025-12-27

Fixed

• WiFi Connect Sync
  • No error notifications in foreign WiFi networks
  • Server reachability check before sync (2s timeout)
  • Silent abort when server offline
  • Pre-check waits until network is ready
  • No errors during network initialization

Changed

• Notifications
  • Old sync notifications cleared on app start
  • Error notifications auto-dismiss after 30 seconds

UI

• Sync icon only shown when sync is configured
• Swipe-to-delete without flicker
• Scroll to top after saving note

Technical

• Server check with 2-second timeout before sync attempts
• Network readiness check in WiFi connect trigger
• Notification cleanup on MainActivity.onCreate()

---

1.1.0 - 2025-12-26

Added

• Configurable Sync Intervals

  • User choice: 15, 30, or 60 minutes
  • Real-world battery impact displayed (15min: ~0.8%/day, 30min: ~0.4%/day, 60min: ~0.2%/day)
  • Radio button selection in settings
  • Doze Mode optimization (syncs batched in maintenance windows)

• About Section

  • App version from BuildConfig
  • Links to GitHub repository and developer profile
  • MIT license information
  • Material 3 card design

Changed

• Settings UI redesigned with grouped sections
• Periodic sync updated dynamically when interval changes
• WorkManager uses selected interval for background sync

Removed

• Debug/Logs section from settings (cleaner UI)

Technical

• PREF_SYNC_INTERVAL_MINUTES preference key
• NetworkMonitor reads interval from SharedPreferences
• ExistingPeriodicWorkPolicy.UPDATE for live interval changes

---

1.0.0 - 2025-12-25

Added

• Initial release
• WebDAV synchronization
• Note creation, editing, deletion
• 6 sync triggers:
  • Periodic sync (configurable interval)
  • App start sync
  • WiFi connect sync
  • Manual sync (menu button)
  • Pull-to-refresh
  • Settings "Sync Now" button
• Material 3 design
• Light/Dark theme support
• F-Droid compatible (100% FOSS)

---