Bug 1870222 - part 5: Make `HTMLEditor::ClearStyleAt` treat non-editable content as visible r=m_kato

Pasting and inserting HTML clears current style to respect the new style.
Therefore, the old ancestors shouldn't be removed when they have only
non-editable content.

Unfortunately, I have no idea how to test all of the paths which are changed
by this patch. However, I believe the method should always treat non-editable
content as visible.

Differential Revision: https://phabricator.services.mozilla.com/D196817

editor/libeditor/HTMLStyleEditor.cpp

@@ -2347,8 +2347,7 @@ Result<EditorDOMPoint, nsresult> HTMLEditor::ClearStyleAt(
           *unwrappedSplitNodeResult.GetPreviousContent(),
           {EmptyCheckOption::TreatSingleBRElementAsVisible,
            EmptyCheckOption::TreatListItemAsVisible,
-           EmptyCheckOption::TreatTableCellAsVisible,
+           EmptyCheckOption::TreatTableCellAsVisible})) {
-           EmptyCheckOption::TreatNonEditableContentAsInvisible})) {
     AutoTrackDOMPoint trackPointToPutCaret(RangeUpdaterRef(), &pointToPutCaret);
     // Delete previous node if it's empty.
     // MOZ_KnownLive(unwrappedSplitNodeResult.GetPreviousContent()):
@@ -2430,8 +2429,7 @@ Result<EditorDOMPoint, nsresult> HTMLEditor::ClearStyleAt(
     if (HTMLEditUtils::IsEmptyNode(
             *unwrappedSplitResultAtStartOfNextNode.GetNextContent(),
             {EmptyCheckOption::TreatListItemAsVisible,
-             EmptyCheckOption::TreatTableCellAsVisible,
+             EmptyCheckOption::TreatTableCellAsVisible},
-             EmptyCheckOption::TreatNonEditableContentAsInvisible},
             &seenBR)) {
       if (seenBR && !brElement) {
         brElement = HTMLEditUtils::GetFirstBRElement(
@@ -2530,8 +2528,7 @@ Result<EditorDOMPoint, nsresult> HTMLEditor::ClearStyleAt(
               *unwrappedSplitResultAtStartOfNextNode.GetNextContent(),
               {EmptyCheckOption::TreatSingleBRElementAsVisible,
                EmptyCheckOption::TreatListItemAsVisible,
-               EmptyCheckOption::TreatTableCellAsVisible,
+               EmptyCheckOption::TreatTableCellAsVisible})) {
-               EmptyCheckOption::TreatNonEditableContentAsInvisible})) {
         // MOZ_KnownLive because the result is grabbed by
         // unwrappedSplitResultAtStartOfNextNode.
         nsresult rv = DeleteNodeWithTransaction(MOZ_KnownLive(
@@ -2550,16 +2547,14 @@ Result<EditorDOMPoint, nsresult> HTMLEditor::ClearStyleAt(
       else if (HTMLEditUtils::IsEmptyNode(
                    *unwrappedSplitResultAtStartOfNextNode.GetNextContent(),
                    {EmptyCheckOption::TreatListItemAsVisible,
-                    EmptyCheckOption::TreatTableCellAsVisible,
+                    EmptyCheckOption::TreatTableCellAsVisible})) {
-                    EmptyCheckOption::TreatNonEditableContentAsInvisible})) {
         AutoTArray<OwningNonNull<nsIContent>, 4> emptyInlineContainerElements;
         HTMLEditUtils::CollectEmptyInlineContainerDescendants(
             *unwrappedSplitResultAtStartOfNextNode.GetNextContentAs<Element>(),
             emptyInlineContainerElements,
             {EmptyCheckOption::TreatSingleBRElementAsVisible,
              EmptyCheckOption::TreatListItemAsVisible,
-             EmptyCheckOption::TreatTableCellAsVisible,
+             EmptyCheckOption::TreatTableCellAsVisible},
-             EmptyCheckOption::TreatNonEditableContentAsInvisible},
             BlockInlineCheck::UseComputedDisplayOutsideStyle);
         for (const OwningNonNull<nsIContent>& emptyInlineContainerElement :
              emptyInlineContainerElements) {

testing/web-platform/tests/editing/data/inserthtml.js

@@ -590,4 +590,17 @@ var browserTests = [
     "<div class=\"d1\"></div><div class=\"d2\"><span class=\"s1\">some text</span><a href=\"foo.html\"></a></div>",
     [true],
     {"inserthtml":[false,false,"",false,false,""]}],
+
+// Do not delete non-editable when clearing the original style
+["<p><b>[X]<span contenteditable=false>abc</span></b><i>def</i></p>",
+    [["inserthtml","<i>Z</i>"]],
+    "<p><i>Z</i><b><span contenteditable=\"false\">abc</span></b><i>def</i></p>",
+    [true],
+    {}],
+["<p><b><span contenteditable=false>abc</span>[Y]</b><i>def</i></p>",
+    [["inserthtml","<i>Z</i>"]],
+    ["<p><b><span contenteditable=\"false\">abc</span></b><i>Z</i><i>def</i></p>",
+     "<p><b><span contenteditable=\"false\">abc</span></b><i>Zdef</i></p>"],
+    [true],
+    {}],
 ]