Bug 1716728 - Part 1: Use IsEmpty() instead of mPaddingBRElementForEmptyEditor existence check r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D118063

editor/libeditor/EditorBase.cpp

@@ -1510,7 +1510,7 @@ nsresult EditorBase::ComputeValueInternal(const nsAString& aFormatType,
       !(aDocumentEncoderFlags & (nsIDocumentEncoder::OutputSelectionOnly |
                                  nsIDocumentEncoder::OutputWrap))) {
     // Shortcut for empty editor case.
-    if (mPaddingBRElementForEmptyEditor) {
+    if (IsEmpty()) {
       aOutputString.Truncate();
       return NS_OK;
     }

editor/libeditor/HTMLEditorDeleteHandler.cpp

@@ -1100,9 +1100,7 @@ EditActionResult HTMLEditor::HandleDeleteSelection(
   // CreateStyleForInsertText()
   TopLevelEditSubActionDataRef().mDidDeleteSelection = true;
 
-  // If there is only padding `<br>` element for empty editor, cancel the
-  // operation.
-  if (mPaddingBRElementForEmptyEditor) {
+  if (IsEmpty()) {
     return EditActionCanceled();
   }
 
@@ -1400,9 +1398,7 @@ EditActionResult HTMLEditor::AutoDeleteRangesHandler::Run(
   mOriginalDirectionAndAmount = aDirectionAndAmount;
   mOriginalStripWrappers = aStripWrappers;
 
-  // If there is only padding `<br>` element for empty editor, cancel the
-  // operation.
-  if (aHTMLEditor.mPaddingBRElementForEmptyEditor) {
+  if (aHTMLEditor.IsEmpty()) {
     return EditActionCanceled();
   }