Prevent favicons from flashing when items are selected in History (#9233)

app/src/main/java/org/mozilla/fenix/library/LibraryPageView.kt

@@ -8,7 +8,6 @@ import android.content.Context
 import android.view.ViewGroup
 import androidx.appcompat.widget.Toolbar
 import androidx.core.content.ContextCompat
-import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.extensions.LayoutContainer
 import mozilla.components.support.ktx.android.content.getColorFromAttr
 import org.mozilla.fenix.R
@@ -22,27 +21,23 @@ open class LibraryPageView(
     protected val activity = context.asActivity()
 
     protected fun setUiForNormalMode(
-        title: String?,
-        libraryItemsList: RecyclerView
+        title: String?
     ) {
         updateToolbar(
             title = title,
             foregroundColor = context.getColorFromAttr(R.attr.primaryText),
             backgroundColor = context.getColorFromAttr(R.attr.foundation)
         )
-        libraryItemsList.adapter?.notifyDataSetChanged()
     }
 
     protected fun setUiForSelectingMode(
-        title: String?,
-        libraryItemsList: RecyclerView
+        title: String?
     ) {
         updateToolbar(
             title = title,
             foregroundColor = ContextCompat.getColor(context, R.color.white_color),
             backgroundColor = context.getColorFromAttr(R.attr.accent)
         )
-        libraryItemsList.adapter?.notifyDataSetChanged()
     }
 
     private fun updateToolbar(title: String?, foregroundColor: Int, backgroundColor: Int) {

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkView.kt

@@ -127,8 +127,7 @@ class BookmarkView(
                 setUiForNormalMode(state.tree)
             is BookmarkFragmentState.Mode.Selecting ->
                 setUiForSelectingMode(
-                    context.getString(R.string.bookmarks_multi_select_title, mode.selectedItems.size),
-                    view.bookmark_list
+                    context.getString(R.string.bookmarks_multi_select_title, mode.selectedItems.size)
                 )
         }
         view.bookmarks_progress_bar.isVisible = state.isLoading
@@ -150,8 +149,7 @@ class BookmarkView(
 
     private fun setUiForNormalMode(root: BookmarkNode?) {
         super.setUiForNormalMode(
-            if (BookmarkRoot.Mobile.id == root?.guid) context.getString(R.string.library_bookmarks) else root?.title,
-            view.bookmark_list
+            if (BookmarkRoot.Mobile.id == root?.guid) context.getString(R.string.library_bookmarks) else root?.title
         )
     }
 

app/src/main/java/org/mozilla/fenix/library/history/HistoryView.kt

@@ -106,14 +106,13 @@ class HistoryView(
         items = state.items
         mode = state.mode
 
-        if (state.mode != oldMode) {
-            interactor.onModeSwitched()
-            historyAdapter.updateMode(state.mode)
+        historyAdapter.updateMode(state.mode)
+        val first = layoutManager.findFirstVisibleItemPosition()
+        val last = layoutManager.findLastVisibleItemPosition() + 1
+        historyAdapter.notifyItemRangeChanged(first, last - first)
 
-            // Deselect all the previously selected items
-            oldMode.selectedItems.forEach {
-                historyAdapter.notifyItemChanged(it.id)
-            }
+        if (state.mode::class != oldMode::class) {
+            interactor.onModeSwitched()
         }
 
         if (state.mode is HistoryFragmentState.Mode.Editing) {
@@ -127,12 +126,10 @@ class HistoryView(
         when (val mode = state.mode) {
             is HistoryFragmentState.Mode.Normal ->
                 setUiForNormalMode(
-                    context.getString(R.string.library_history),
-                    view.history_list)
+                    context.getString(R.string.library_history))
             is HistoryFragmentState.Mode.Editing ->
                 setUiForSelectingMode(
-                    context.getString(R.string.history_multi_select_title, mode.selectedItems.size),
-                    view.history_list)
+                    context.getString(R.string.history_multi_select_title, mode.selectedItems.size))
         }
     }
 

app/src/main/java/org/mozilla/fenix/library/history/viewholders/HistoryListItemViewHolder.kt

@@ -46,8 +46,6 @@ class HistoryListItemViewHolder(
         showDeleteButton: Boolean,
         mode: HistoryFragmentState.Mode
     ) {
-        this.item = item
-
         itemView.history_layout.titleView.text = item.title
         itemView.history_layout.urlView.text = item.url
 
@@ -58,12 +56,18 @@ class HistoryListItemViewHolder(
 
         itemView.history_layout.setSelectionInteractor(item, selectionHolder, historyInteractor)
         itemView.history_layout.changeSelected(item in selectionHolder.selectedItems)
-        itemView.history_layout.loadFavicon(item.url)
-        if (mode === HistoryFragmentState.Mode.Normal) {
+
+        if (this.item?.url != item.url) {
+            itemView.history_layout.loadFavicon(item.url)
+        }
+
+        if (item !in selectionHolder.selectedItems) {
             itemView.overflow_menu.showAndEnable()
         } else {
             itemView.overflow_menu.hideAndDisable()
         }
+
+        this.item = item
     }
 
     private fun toggleHeader(headerText: String?) {