Bottom sheet styles were actually fixed.

res/values-notnight-v28/themes.xml

@@ -30,7 +30,7 @@
 <!--        <item name="colorControlHighlight">@color/accent</item>-->
         <item name="alertDialogTheme">@style/AppCompatAlertDialogStyleLight</item>
         <item name="android:alertDialogTheme">@style/AppCompatDialogStyleLight</item>
-        <item name="bottomSheetDialogTheme">@style/Theme.MaterialComponents.Light.BottomSheetDialog</item>
+<!--        <item name="bottomSheetDialogTheme">@style/Theme.MaterialComponents.Light.BottomSheetDialog</item>-->
         <!--<item name="android:windowContentOverlay">@drawable/compat_actionbar_shadow_background</item>-->
 
         <item name="attachment_type_selector_background">@color/white</item>

res/values/styles.xml

@@ -29,11 +29,7 @@
         <item name="buttonBarPositiveButtonStyle">@style/Session.AlertDialog.PositiveButtonStyle</item>
     </style>
 
-    <style name="SessionBottomSheetDialogTheme" parent="Theme.Design.BottomSheetDialog">
-        <item name="bottomSheetStyle">@style/SessionBottomSheetStyle</item>
-    </style>
-
-    <style name="SessionBottomSheetStyle" parent="Widget.Design.BottomSheet.Modal">
+    <style name="Widget.Session.BottomSheetDialog" parent="Widget.Design.BottomSheet.Modal">
         <item name="android:background">@drawable/default_bottom_sheet_background</item>
     </style>
 

res/values/themes.xml

@@ -27,7 +27,7 @@
         <item name="actionBarStyle">@style/Widget.Session.ActionBar</item>
 
         <item name="alertDialogTheme">@style/Session.AlertDialog</item>
-        <item name="bottomSheetDialogTheme">@style/SessionBottomSheetDialogTheme</item>
+        <item name="bottomSheetStyle">@style/Widget.Session.BottomSheetDialog</item>
         <item name="preferenceTheme">@style/Session.SettingsTheme</item>
         <item name="statusBarBackground">@color/accent</item>
         <item name="android:windowDrawsSystemBarBackgrounds">true</item>

src/org/thoughtcrime/securesms/loki/dialogs/ConversationOptionsBottomSheet.kt

@@ -25,11 +25,7 @@ public class ConversationOptionsBottomSheet : BottomSheetDialogFragment() {
     var onDeleteTapped: (() -> Unit)? = null
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
-        //FIXME AC: For some reason this fragment (created from HomeActivity)
-        // is not using the activity's theme. So we have to enforce it.
-        return LayoutInflater.from(ContextThemeWrapper(requireContext(), R.style.Theme_Session_DayNight))
-                .inflate(R.layout.fragment_conversation_bottom_sheet, container, false)
-//        return inflater.inflate(R.layout.fragment_conversation_bottom_sheet, container, false)
+        return inflater.inflate(R.layout.fragment_conversation_bottom_sheet, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

src/org/thoughtcrime/securesms/loki/dialogs/MultiDeviceRemovalBottomSheet.kt

@@ -37,7 +37,7 @@ class MultiDeviceRemovalBottomSheet : BottomSheetDialogFragment() {
     }
 
     private val explanation by lazy {
-        if (TextSecurePreferences.getMasterHexEncodedPublicKey(context!!) != null) {
+        if (TextSecurePreferences.getMasterHexEncodedPublicKey(requireContext()) != null) {
             "You’re seeing this because this is a secondary device in a multi-device setup. To improve reliability and stability, we’ve decided to temporarily disable Session’s multi-device functionality. Device linking has been disabled, and existing secondary clients will be erased on $removalDateDescription.\n\nTo read more about this change, visit the Session FAQ at getsession.org/faq."
         } else {
             "You’re seeing this because you have a secondary device linked to your Session ID. To improve reliability and stability, we’ve decided to temporarily disable Session’s multi-device functionality. Device linking has been disabled, and existing secondary clients will be erased on $removalDateDescription.\n\nTo read more about this change, visit the Session FAQ at getsession.org/faq"
@@ -49,7 +49,7 @@ class MultiDeviceRemovalBottomSheet : BottomSheetDialogFragment() {
         val removalDateStartIndex = explanation.indexOf(removalDateDescription)
         val removalDateEndIndex = removalDateStartIndex + removalDateDescription.count()
         result.setSpan(StyleSpan(Typeface.BOLD), removalDateStartIndex, removalDateEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
-        result.setSpan(ForegroundColorSpan(resources.getColorWithID(R.color.accent, context!!.theme)), removalDateStartIndex, removalDateEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+        result.setSpan(ForegroundColorSpan(resources.getColorWithID(R.color.accent, requireContext().theme)), removalDateStartIndex, removalDateEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
         val link = "getsession.org/faq"
         val linkStartIndex = explanation.indexOf(link)
         val linkEndIndex = linkStartIndex + link.count()
@@ -59,20 +59,15 @@ class MultiDeviceRemovalBottomSheet : BottomSheetDialogFragment() {
                 try {
                     onLinkTapped?.invoke()
                 } catch (e: Exception) {
-                    Toast.makeText(context!!, R.string.invalid_url, Toast.LENGTH_SHORT).show()
+                    Toast.makeText(requireContext(), R.string.invalid_url, Toast.LENGTH_SHORT).show()
                 }
             }
         }, linkStartIndex, linkEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
         result.setSpan(StyleSpan(Typeface.BOLD), linkStartIndex, linkEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
-        result.setSpan(ForegroundColorSpan(resources.getColorWithID(R.color.accent, context!!.theme)), linkStartIndex, linkEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+        result.setSpan(ForegroundColorSpan(resources.getColorWithID(R.color.accent, requireContext().theme)), linkStartIndex, linkEndIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
         result
     }
 
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setStyle(STYLE_NORMAL, R.style.SessionBottomSheetDialogTheme)
-    }
-
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         return inflater.inflate(R.layout.fragment_multi_device_removal_bottom_sheet, container, false)
     }

src/org/thoughtcrime/securesms/loki/dialogs/OpenGroupSuggestionBottomSheet.kt

@@ -12,11 +12,6 @@ class OpenGroupSuggestionBottomSheet : BottomSheetDialogFragment() {
     var onJoinTapped: (() -> Unit)? = null
     var onDismissTapped: (() -> Unit)? = null
 
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setStyle(STYLE_NORMAL, R.style.SessionBottomSheetDialogTheme)
-    }
-
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         return inflater.inflate(R.layout.fragment_open_group_suggestion_bottom_sheet, container, false)
     }