Fix extension search query cursor and debounce (#8972)

* Fix extension search query cursor

* debounce

* extract debounce constant

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryScreenModel.kt

@@ -26,6 +26,7 @@ import eu.kanade.domain.manga.interactor.GetLibraryManga
 import eu.kanade.domain.manga.interactor.UpdateManga
 import eu.kanade.domain.manga.model.isLocal
 import eu.kanade.domain.track.interactor.GetTracksPerManga
+import eu.kanade.presentation.components.SEARCH_DEBOUNCE_MILLIS
 import eu.kanade.presentation.library.components.LibraryToolbarTitle
 import eu.kanade.presentation.manga.DownloadAction
 import eu.kanade.tachiyomi.data.cache.CoverCache
@@ -44,6 +45,7 @@ import eu.kanade.tachiyomi.widget.ExtendedNavigationView.Item.TriStateGroup
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.debounce
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOf
@@ -92,7 +94,7 @@ class LibraryScreenModel(
     init {
         coroutineScope.launchIO {
             combine(
-                state.map { it.searchQuery }.distinctUntilChanged(),
+                state.map { it.searchQuery }.distinctUntilChanged().debounce(SEARCH_DEBOUNCE_MILLIS),
                 getLibraryFlow(),
                 getTracksPerManga.subscribe(),
                 getTrackingFilterFlow(),