Fix fullscreen not applying on opening reader (fixes #4723)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -397,10 +397,6 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
      * [animate] the views.
      */
     fun setMenuVisibility(visible: Boolean, animate: Boolean = true) {
-        if (visible == menuVisible) {
-            return
-        }
-
         menuVisible = visible
         if (visible) {
             if (preferences.fullscreen().get()) {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReaderSettingsSheet.kt

@@ -23,13 +23,20 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : TabbedBottomSh
 
         val filterTabIndex = getTabViews().indexOf(colorFilterSettings)
         binding.tabs.addOnTabSelectedListener(object : SimpleTabSelectedListener() {
-            // Remove dimmed backdrop so color filter changes can be previewed
             override fun onTabSelected(tab: TabLayout.Tab?) {
                 val isFilterTab = tab?.position == filterTabIndex
+
+                // Remove dimmed backdrop so color filter changes can be previewed
                 window?.setDimAmount(if (isFilterTab) 0f else sheetBackgroundDim)
-                activity.setMenuVisibility(!isFilterTab)
+
+                // Hide toolbars
+                if (activity.menuVisible != !isFilterTab) {
+                    activity.setMenuVisibility(!isFilterTab)
+                }
+
+                // Partially collapse the sheet for better preview
                 if (isFilterTab) {
-                    sheetBehavior?.state = BottomSheetBehavior.STATE_HALF_EXPANDED
+                    sheetBehavior.state = BottomSheetBehavior.STATE_HALF_EXPANDED
                 }
             }
         })