Improve performance across screens (#4071)

* Keep screens loaded while they're hidden and rebuild the library faster

* Count chapters in SQL for the migration list

* Show the extension list sooner and check trust against loaded stores

* Cancel the previous tracker search when searching again

* Write reader progress less often and keep its work off the main thread

* Stop rebuilding the settings search index on every key

* Watch updates for widgets only while one is placed

The query re-ran on every chapter or manga write even with no widget on
the home screen.

* Observe download pages and limit how often their progress updates

* Throttle the library update notification and write fetch data together

domain/src/main/java/tachiyomi/domain/chapter/interactor/GetChapterSummaryByMangaId.kt

@@ -0,0 +1,15 @@
+package tachiyomi.domain.chapter.interactor
+
+import dev.zacsweers.metro.Inject
+import tachiyomi.domain.chapter.model.ChapterSummary
+import tachiyomi.domain.chapter.repository.ChapterRepository
+
+@Inject
+class GetChapterSummaryByMangaId(
+    private val chapterRepository: ChapterRepository,
+) {
+
+    suspend fun await(mangaId: Long): ChapterSummary {
+        return chapterRepository.getChapterSummaryByMangaId(mangaId)
+    }
+}

domain/src/main/java/tachiyomi/domain/chapter/model/ChapterSummary.kt

@@ -0,0 +1,6 @@
+package tachiyomi.domain.chapter.model
+
+data class ChapterSummary(
+    val chapterCount: Long,
+    val latestChapterNumber: Double?,
+)

domain/src/main/java/tachiyomi/domain/chapter/repository/ChapterRepository.kt

@@ -3,6 +3,7 @@ package tachiyomi.domain.chapter.repository
 import kotlinx.coroutines.flow.Flow
 import tachiyomi.domain.chapter.model.Chapter
 import tachiyomi.domain.chapter.model.ChapterRemoteUpdate
+import tachiyomi.domain.chapter.model.ChapterSummary
 import tachiyomi.domain.chapter.model.ChapterUpdate
 
 interface ChapterRepository {
@@ -19,6 +20,8 @@ interface ChapterRepository {
 
     suspend fun getChapterByMangaId(mangaId: Long, applyScanlatorFilter: Boolean = false): List<Chapter>
 
+    suspend fun getChapterSummaryByMangaId(mangaId: Long): ChapterSummary
+
     suspend fun getScanlatorsByMangaId(mangaId: Long): List<String>
 
     fun getScanlatorsByMangaIdAsFlow(mangaId: Long): Flow<List<String>>