The horizontal layout (_buildHorizontalLayout) used FittedBox as a
shared scaffold for both vertical and horizontal reading modes.
FittedBox passes unbounded width constraints to its child, which caused
RenderFlex to throw "children have non-zero flex but incoming width
constraints are unbounded" when Row + Expanded children were used.
This cascaded into a chain of "RenderBox was not laid out" assertions
all the way up through IntrinsicHeight, ConstrainedBox, FittedBox,
LayoutBuilder, and into the ScrollablePositionedList in
image_view_webtoon.dart.
Fix: split the two layout paths before they reach a scaffold widget.
The vertical path keeps FittedBox (safe, maxWidth is capped at 480px).
The horizontal path uses SizedBox(width: MediaQuery screenWidth) so
Row/Expanded always receive a finite width constraint.
Replace per-card Isar tracking streams with a single subscription in
TrackerSectionScreen.
- Build a mediaId -> Track index at the screen level
- Pass resolved Track? into TrackerLibraryImageCard
- Convert TrackerLibraryImageCard to a plain StatelessWidget
- Remove StreamBuilder, ConsumerStatefulWidget, and keep-alive boilerplate
- Keep the same UI while reducing widget-level DB work
This follows the same parent-index pattern used elsewhere and makes
the tracker library view lighter and easier to maintain.
Remove synchronous Isar queries from each library grid item when
downloadedChapter is enabled.
- Replace per-card download queries with downloadedChapterIdsProvider
- Compute downloadCount via in-memory lookup instead of DB calls
- Eliminate repeated sync queries on rebuilds and tab switches
- Minor cleanup of unread chapter filter
This avoids dozens of synchronous queries per frame and significantly
improves grid performance and responsiveness.
Replace per-widget Isar StreamBuilder usage with a single shared
library index managed in MangaHomeScreen.
- Subscribe once to manga updates and build a name -> Manga map
- Pass libraryManga down to card widgets instead of querying per item
- Remove StreamBuilder logic from MangaImageCardWidget and list tile
- Use library data for cover, tracker image, and favorite state
- Add favorite overlay indicator based on libraryManga
- Clean up redundant filtering and improve performance
This reduces rebuild overhead and avoids multiple database listeners
per list/grid item.
`addListener` is called inside the `data:` callback of `build()`.
Every single time the widget rebuilds, which happens on scroll, on tab switch,
on any `setState`, it adds *another* listener to `_scrollController`,
stacking up indefinitely. With 100 items and active scrolling,
you can easily accumulate hundreds of listeners,
each one firing `setState` + `_loadMore()` on every scroll-to-bottom.
Fix: Move the listener setup to `initState()` and remove it in `dispose()`
Each UChapDataPreload holds a GetChapterPagesModel that itself holds all pageUrls, archiveImages, etc. For a 50-page chapter this creates 50 model objects each referencing all 50 URLs.
Fix an Exception:
```
════════ Exception caught by rendering library ═════════════════════════════════
A RenderFlex overflowed by 274 pixels on the bottom.
The relevant error-causing widget was:
Column Column:file:///lib/modules/manga/reader/widgets/chapter_transition_page.dart:28:18
════════════════════════════════════════════════════════════════════════════════
```
Improved: The UI adapts to the reading mode now
