Fix crash when delete scheduled message dialog is open and message sends.

app/src/main/java/org/thoughtcrime/securesms/conversation/ScheduledMessagesBottomSheet.kt

@@ -64,6 +64,7 @@ class ScheduledMessagesBottomSheet : FixedRoundedCornerBottomSheetDialogFragment
   override val themeResId: Int = R.style.Widget_Signal_FixedRoundedCorners_Messages
 
   private var firstRender: Boolean = true
+  private var deleteDialog: AlertDialog? = null
 
   private lateinit var messageAdapter: ConversationAdapter
   private lateinit var callback: Callback
@@ -112,7 +113,8 @@ class ScheduledMessagesBottomSheet : FixedRoundedCornerBottomSheetDialogFragment
 
     disposables += viewModel.getMessages(requireContext()).subscribe { messages ->
       if (messages.isEmpty()) {
-        dismiss()
+        deleteDialog?.dismiss()
+        dismissAllowingStateLoss()
       }
 
       messageAdapter.submitList(messages) {
@@ -176,7 +178,10 @@ class ScheduledMessagesBottomSheet : FixedRoundedCornerBottomSheetDialogFragment
   }
 
   private fun handleDeleteMessage(messageRecord: MessageRecord) {
-    buildDeleteScheduledMessageConfirmationDialog(messageRecord).show()
+    deleteDialog?.dismiss()
+    deleteDialog = buildDeleteScheduledMessageConfirmationDialog(messageRecord)
+      .setOnDismissListener { deleteDialog = null }
+      .show()
   }
 
   private fun handleCopyMessage(message: ConversationMessage) {
@@ -221,17 +226,19 @@ class ScheduledMessagesBottomSheet : FixedRoundedCornerBottomSheetDialogFragment
   }
 
   private fun deleteMessage(messageId: Long) {
+    context?.let { context ->
       val progressDialog = SignalProgressDialog.show(
-      context = requireContext(),
+        context = context,
         message = resources.getString(R.string.ScheduledMessagesBottomSheet_deleting_progress_message),
         indeterminate = true
       )
-    SimpleTask.run(viewLifecycleOwner.lifecycle, {
+      SimpleTask.run({
         SignalDatabase.messages.deleteScheduledMessage(messageId)
       }, {
         progressDialog.dismiss()
       })
     }
+  }
 
   override fun onReschedule(scheduledTime: Long, messageId: Long) {
     viewModel.rescheduleMessage(messageId, scheduledTime)