Fix action mode back handling in conversation fragment.

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationFragment.kt

@@ -934,6 +934,8 @@ class ConversationFragment :
   //endregion
 
   private fun startActionMode() {
+    viewModel.setIsInActionMode(true)
+
     actionModeTopBarView.isVisible = true
     actionModeTopBarView.onCloseClick = this::finishActionMode
     actionModeTopBarView.title = calculateSelectedItemCount()
@@ -958,6 +960,8 @@ class ConversationFragment :
   }
 
   private fun finishActionMode() {
+    viewModel.setIsInActionMode(false)
+
     actionModeTopBarView.isVisible = false
 
     adapter.clearSelection()
@@ -2497,6 +2501,8 @@ class ConversationFragment :
         reactionDelegate.hide()
       } else if (state.isSearchRequested) {
         searchMenuItem?.collapseActionView()
+      } else if (state.isInActionMode) {
+        finishActionMode()
       }
     }
   }

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationViewModel.kt

@@ -654,6 +654,12 @@ class ConversationViewModel(
     }
   }
 
+  fun setIsInActionMode(isInActionMode: Boolean) {
+    internalBackPressedState.update {
+      it.copy(isInActionMode = isInActionMode)
+    }
+  }
+
   fun toggleVote(poll: PollRecord, pollOption: PollOption, isChecked: Boolean) {
     viewModelScope.launch(Dispatchers.IO) {
       val voteCount = if (isChecked) {
@@ -678,8 +684,9 @@ class ConversationViewModel(
 
   data class BackPressedState(
     val isReactionDelegateShowing: Boolean = false,
-    val isSearchRequested: Boolean = false
+    val isSearchRequested: Boolean = false,
+    val isInActionMode: Boolean = false
   ) {
-    fun shouldHandleBackPressed() = isSearchRequested || isReactionDelegateShowing
+    fun shouldHandleBackPressed() = isSearchRequested || isReactionDelegateShowing || isInActionMode
   }
 }