Bug 1675779 - HandleDeleteAtomicContent should handle non-editable text node. r=masayuki

Since `WSScanResult` can return non-editable/non-removable text node,
`HandleDeleteAtomicContent` is called with non editable text node, then it cannot
remove atomic content.

This fix doesn't follow other block case such as added newer test.

Differential Revision: https://phabricator.services.mozilla.com/D96298

editor/libeditor/HTMLEditorDeleteHandler.cpp

@@ -257,6 +257,23 @@ class MOZ_STACK_CLASS HTMLEditor::AutoDeleteRangesHandler final {
       const HTMLEditor& aHTMLEditor, const nsIContent& aAtomicContent,
       AutoRangeArray& aRangesToDelete) const;
 
+  /**
+   * GetAtomicContnetToDelete() returns better content that is deletion of
+   * atomic element.  If aScanFromCaretPointResult is special, since this
+   * point may not be editable, we look for better point to remove atomic
+   * content.
+   *
+   * @param aDirectionAndAmount       Direction of the deletion.
+   * @param aWSRunScannerAtCaret      WSRunScanner instance which was
+   *                                  initialized with the caret point.
+   * @param aScanFromCaretPointResult Scan result of aWSRunScannerAtCaret
+   *                                  toward aDirectionAndAmount.
+   */
+  static nsIContent* GetAtomicContentToDelete(
+      nsIEditor::EDirection aDirectionAndAmount,
+      const WSRunScanner& aWSRunScannerAtCaret,
+      const WSScanResult& aScanFromCaretPointResult) MOZ_NONNULL_RETURN;
+
   /**
    * HandleDeleteHRElement() handles deletion around `<hr>` element.  If
    * aDirectionAndAmount is nsIEditor::ePrevious, aHTElement is removed only
@@ -1637,8 +1654,16 @@ HTMLEditor::AutoDeleteRangesHandler::ComputeRangesToDeleteAroundCollapsedRanges(
         aWSRunScannerAtCaret.GetEditingHost()) {
       return NS_OK;
     }
+    nsIContent* atomicContent = GetAtomicContentToDelete(
+        aDirectionAndAmount, aWSRunScannerAtCaret, aScanFromCaretPointResult);
+    if (!HTMLEditUtils::IsRemovableNode(*atomicContent)) {
+      NS_WARNING(
+          "AutoDeleteRangesHandler::GetAtomicContentToDelete() cannot find "
+          "removable atomic content");
+      return NS_ERROR_FAILURE;
+    }
     nsresult rv = ComputeRangesToDeleteAtomicContent(
-        aHTMLEditor, *aScanFromCaretPointResult.GetContent(), aRangesToDelete);
+        aHTMLEditor, *atomicContent, aRangesToDelete);
     NS_WARNING_ASSERTION(
         NS_SUCCEEDED(rv),
         "AutoDeleteRangesHandler::ComputeRangesToDeleteAtomicContent() failed");
@@ -1665,6 +1690,10 @@ HTMLEditor::AutoDeleteRangesHandler::ComputeRangesToDeleteAroundCollapsedRanges(
     if (NS_WARN_IF(!aScanFromCaretPointResult.GetContent()->IsElement())) {
       return NS_ERROR_FAILURE;
     }
+    // TODO(m_kato):
+    // When aScanFromCaretPointResult.GetContent isn't editable and is
+    // removable, PrepareToDeleteAtOtherBlockBoundary will return false.
+    // But this should be removed.
     AutoBlockElementsJoiner joiner(*this);
     if (!joiner.PrepareToDeleteAtOtherBlockBoundary(
             aHTMLEditor, aDirectionAndAmount,
@@ -1764,9 +1793,17 @@ HTMLEditor::AutoDeleteRangesHandler::HandleDeleteAroundCollapsedRanges(
         aWSRunScannerAtCaret.GetEditingHost()) {
       return EditActionHandled();
     }
+    nsCOMPtr<nsIContent> atomicContent = GetAtomicContentToDelete(
+        aDirectionAndAmount, aWSRunScannerAtCaret, aScanFromCaretPointResult);
+    if (!HTMLEditUtils::IsRemovableNode(*atomicContent)) {
+      NS_WARNING(
+          "AutoDeleteRangesHandler::GetAtomicContentToDelete() cannot find "
+          "removable atomic content");
+      return EditActionResult(NS_ERROR_FAILURE);
+    }
     EditActionResult result = HandleDeleteAtomicContent(
-        aHTMLEditor, MOZ_KnownLive(*aScanFromCaretPointResult.GetContent()),
+        aHTMLEditor, *atomicContent, aWSRunScannerAtCaret.ScanStartRef(),
-        aWSRunScannerAtCaret.ScanStartRef(), aWSRunScannerAtCaret);
+        aWSRunScannerAtCaret);
     NS_WARNING_ASSERTION(
         result.Succeeded(),
         "AutoDeleteRangesHandler::HandleDeleteAtomicContent() failed");
@@ -2264,6 +2301,38 @@ EditActionResult HTMLEditor::AutoDeleteRangesHandler::HandleDeleteHRElement(
   return EditActionHandled(rv);
 }
 
+// static
+nsIContent* HTMLEditor::AutoDeleteRangesHandler::GetAtomicContentToDelete(
+    nsIEditor::EDirection aDirectionAndAmount,
+    const WSRunScanner& aWSRunScannerAtCaret,
+    const WSScanResult& aScanFromCaretPointResult) {
+  MOZ_ASSERT(aScanFromCaretPointResult.GetContent());
+
+  if (!aScanFromCaretPointResult.ReachedSpecialContent()) {
+    return aScanFromCaretPointResult.GetContent();
+  }
+
+  if (!aScanFromCaretPointResult.GetContent()->IsText() ||
+      HTMLEditUtils::IsRemovableNode(*aScanFromCaretPointResult.GetContent())) {
+    return aScanFromCaretPointResult.GetContent();
+  }
+
+  // aScanFromCaretPointResult is non-removable text node.
+  // Since we try removing atomic content, we look for removable node from
+  // scanned point that is non-removable text.
+  nsIContent* removableRoot = aScanFromCaretPointResult.GetContent();
+  while (removableRoot && !HTMLEditUtils::IsRemovableNode(*removableRoot)) {
+    removableRoot = removableRoot->GetParent();
+  }
+
+  if (removableRoot) {
+    return removableRoot;
+  }
+
+  // Not found better content. This content may not be removable.
+  return aScanFromCaretPointResult.GetContent();
+}
+
 nsresult
 HTMLEditor::AutoDeleteRangesHandler::ComputeRangesToDeleteAtomicContent(
     const HTMLEditor& aHTMLEditor, const nsIContent& aAtomicContent,

testing/web-platform/meta/editing/run/delete.html.ini

@@ -697,3 +697,6 @@
   [[["delete",""\]\] "<div>  a[\]bc</div>" compare innerHTML]
     expected: FAIL
 
+  [[["delete",""\]\] "foo<div contenteditable=false>bar</div>[\]baz" compare innerHTML]
+    expected: FAIL
+

testing/web-platform/meta/editing/run/forwarddelete.html.ini

@@ -506,8 +506,8 @@
 
 
 [forwarddelete.html?6001-last]
-  max-asserts: 3
+  max-asserts: 6
-  min-asserts: 3
+  min-asserts: 6
   [[["forwarddelete",""\]\] "<ol><li>foo</ol><p>{}<br></p><ol><li>bar</ol>" compare innerHTML]
     expected: FAIL
 

testing/web-platform/meta/editing/run/insertparagraph.html.ini

@@ -300,7 +300,7 @@
 
 
 [insertparagraph.html?5001-6000]
-  min-asserts: 14 # Retrieving meaningless raw DOM point from WSScannerResult
+  min-asserts: 10 # Retrieving meaningless raw DOM point from WSScannerResult
   max-asserts: 16 # Only on W-fis on Linux1804-64-qr and on Android, there are 2 additional assertions.
   [[["defaultparagraphseparator","p"\],["insertparagraph",""\]\] "<ul><li><div>foo[\]</ul>" compare innerHTML]
     expected: FAIL

testing/web-platform/meta/input-events/input-events-get-target-ranges-backspace.tentative.html.ini

@@ -52,6 +52,3 @@
   [Backspace at "<div>abc  <ul><li>[\] def </li></ul>  ghi</div>" - comparing innerHTML]
     expected: FAIL
 
-  [Backspace at "<p>abc<span contenteditable=\"false\">def</span>[\]ghi</p>"]
-    expected: FAIL
-

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

@@ -2560,4 +2560,29 @@ var browserTests = [
     "foo{}bar",
     [true],
     {"delete":[false,false,"",false,false,""]}],
+["foo<span contenteditable=false>bar</span>[]baz",
+    [["delete",""]],
+    "foo{}baz",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
+["foo<span contenteditable=false><span>b</span><span>a</span><span>r</span></span>[]baz",
+    [["delete",""]],
+    "foo{}baz",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
+["foo<div contenteditable=false>bar</div>[]baz",
+    [["delete",""]],
+    "foo{}baz",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
+["foo<span contenteditable=false><b>bar</b></span>[]baz",
+    [["delete",""]],
+    "foo{}baz",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
+["foo<span>bar<span contenteditable=false>baz</span></span>[]qux",
+    [["delete",""]],
+    "foo<span>bar{}</span>qux",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
 ]

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

@@ -2445,4 +2445,29 @@ var browserTests = [
     "foo{}bar",
     [true],
     {"forwarddelete":[false,false,"",false,false,""]}],
+["foo[]<span contenteditable=false>bar</span>baz",
+    [["forwarddelete",""]],
+    "foo{}baz",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
+["foo[]<span contenteditable=false><span>b</span><span>a</span><span>r</span></span>baz",
+    [["forwarddelete",""]],
+    "foo{}baz",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
+["foo[]<div contenteditable=false>bar</div>baz",
+    [["forwarddelete",""]],
+    "foo{}baz",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
+["foo[]<span contenteditable=false><b>bar</b></span>baz",
+    [["forwarddelete",""]],
+    "foo{}baz",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
+["foo<span>bar[]<span contenteditable=false>baz</span></span>qux",
+    [["forwarddelete",""]],
+    "foo<span>bar{}</span>qux",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
 ]