Fixes missing parental ratings & focus loss when changing filters (#1559)

## Description
- Ensures all parent ratings are shown in the filter drop down
- Fixes focus loss after filtering library and there are no results

### Related issues
Fixes #1535 (along w/ #1529)
Fixes #1534

### Testing
Emulator w/ a UK movie library

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/services/FilterOptionCache.kt

@@ -124,9 +124,9 @@ class FilterOptionCache
                         parentId = parentId,
                         userId = userId,
                     ).content.officialRatings
-                    ?.mapNotNull { r ->
-                        val value = ratings[r]
-                        value?.let { FilterValueOption(r, value) }
+                    ?.map { r ->
+                        val value = ratings[r] ?: 0
+                        FilterValueOption(r, value)
                     }?.sortedBy { it.value as Int }
                     .orEmpty()
             }

app/src/main/java/com/github/damontecres/wholphin/ui/components/CollectionFolderGrid.kt

@@ -21,6 +21,8 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.focusRestorer
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.style.TextAlign
@@ -270,6 +272,8 @@ fun CollectionFolderHeader(
     currentFilter: GetItemsFilter = GetItemsFilter(),
     filterOptions: List<ItemFilterBy<*>> = listOf(),
     onFilterChange: (GetItemsFilter) -> Unit = {},
+    onShowFilterDropdown: ((Boolean) -> Unit)? = null,
+    filterButtonFocusRequester: FocusRequester = remember { FocusRequester() },
 ) {
     AnimatedVisibility(
         showHeader,
@@ -292,13 +296,14 @@ fun CollectionFolderHeader(
                 modifier =
                     Modifier
                         .padding(start = 16.dp, end = endPadding)
+                        .focusRestorer()
                         .fillMaxWidth(),
             ) {
                 if (sortOptions.isNotEmpty() || filterOptions.isNotEmpty()) {
                     Row(
                         horizontalArrangement = Arrangement.spacedBy(8.dp),
                         verticalAlignment = Alignment.CenterVertically,
-                        modifier = Modifier,
+                        modifier = Modifier.focusRestorer(),
                     ) {
                         if (sortOptions.isNotEmpty()) {
                             SortByButton(
@@ -314,7 +319,8 @@ fun CollectionFolderHeader(
                                 current = currentFilter,
                                 onFilterChange = onFilterChange,
                                 getPossibleValues = getPossibleFilterValues,
-                                modifier = Modifier,
+                                modifier = Modifier.focusRequester(filterButtonFocusRequester),
+                                onShow = onShowFilterDropdown,
                             )
                         }
                         ExpandableFaButton(
@@ -329,7 +335,7 @@ fun CollectionFolderHeader(
                     Row(
                         horizontalArrangement = Arrangement.spacedBy(8.dp),
                         verticalAlignment = Alignment.CenterVertically,
-                        modifier = Modifier,
+                        modifier = Modifier.focusRestorer(),
                     ) {
                         ExpandablePlayButton(
                             title = R.string.play,

app/src/main/java/com/github/damontecres/wholphin/ui/components/CollectionFolderView.kt

@@ -659,6 +659,9 @@ fun CollectionFolderView(
 
     val contextMenu = rememberContextMenu(preferences, viewModel)
     var showViewOptions by rememberSaveable { mutableStateOf(false) }
+    var filterDropdownShowing by remember { mutableStateOf(false) }
+    val headerRowFocusRequester = remember { FocusRequester() }
+    val filterButtonFocusRequester = remember { FocusRequester() }
 
     val gridActions =
         remember(actions) {
@@ -741,7 +744,6 @@ fun CollectionFolderView(
                         ?: item?.data?.collectionType?.name
                         ?: stringResource(R.string.collection)
                 Column(modifier = Modifier.fillMaxSize()) {
-                    val headerRowFocusRequester = remember { FocusRequester() }
                     LifecycleResumeEffect(itemId) {
                         viewModel.onResumePage()
 
@@ -780,6 +782,8 @@ fun CollectionFolderView(
                         onClickPlayAll = gridActions.onClickPlayAll!!,
                         onClickShowViewOptions = { showViewOptions = true },
                         modifier = Modifier.focusRequester(headerRowFocusRequester),
+                        onShowFilterDropdown = { filterDropdownShowing = it },
+                        filterButtonFocusRequester = filterButtonFocusRequester,
                     )
 
                     when (val pager = state.items) {
@@ -798,9 +802,14 @@ fun CollectionFolderView(
 
                         is DataLoadingState.Success<List<BaseItem?>> -> {
                             LaunchedEffect(Unit) {
-                                if (pager.data.isNotEmpty()) {
-                                    gridFocusRequester.tryRequestFocus()
-                                }
+                                val focusRequester =
+                                    when {
+                                        contextMenu.isShowing -> null
+                                        filterDropdownShowing -> filterButtonFocusRequester
+                                        pager.data.isNotEmpty() -> gridFocusRequester
+                                        else -> focusRequesterOnEmpty ?: headerRowFocusRequester
+                                    }
+                                focusRequester?.tryRequestFocus()
                             }
                             Box(Modifier.fillMaxSize()) {
                                 if (state.viewOptions.type == ViewOptionsType.GRID) {

app/src/main/java/com/github/damontecres/wholphin/ui/components/ContextMenuUtils.kt

@@ -36,6 +36,8 @@ class ContextMenuUtils(
 ) {
     private var showContextMenu by mutableStateOf<Pair<Int, BaseItem>?>(null)
 
+    val isShowing: Boolean get() = showContextMenu != null
+
     /**
      * Show the context menu, typically from a long click
      */

app/src/main/java/com/github/damontecres/wholphin/ui/components/FilterByButton.kt

@@ -71,6 +71,7 @@ fun FilterByButton(
     onFilterChange: (GetItemsFilter) -> Unit,
     getPossibleValues: suspend (ItemFilterBy<*>) -> List<FilterValueOption>,
     modifier: Modifier = Modifier,
+    onShow: ((Boolean) -> Unit)? = null,
 ) {
     var dropDown by remember { mutableStateOf(false) }
     var nestedDropDown by remember { mutableStateOf<ItemFilterBy<*>?>(null) }
@@ -79,7 +80,10 @@ fun FilterByButton(
     Box(modifier = modifier) {
         ExpandableFilterButton(
             filterCount = filterCount,
-            onClick = { dropDown = true },
+            onClick = {
+                onShow?.invoke(true)
+                dropDown = true
+            },
             modifier = Modifier,
         )
 
@@ -87,6 +91,7 @@ fun FilterByButton(
             expanded = dropDown,
             containerColor = MaterialTheme.colorScheme.surfaceColorAtElevation(3.dp),
             onDismissRequest = {
+                onShow?.invoke(false)
                 dropDown = false
                 nestedDropDown = null
             },