Bug 1746104 - part 5-1: Get rid of WidgetQueryContentEvent::Reply::mHasSelection r=m_kato

It's intended to indicate whether the selection is collapsed or not, but it can
be referred by other members, there is no reasonable user and the name makes
developers confused.

Differential Revision: https://phabricator.services.mozilla.com/D137422

dom/events/ContentEventHandler.cpp

@@ -423,8 +423,6 @@ nsresult ContentEventHandler::Init(WidgetQueryContentEvent* aEvent) {
 
   aEvent->mReply->mContentsRoot = mRootContent.get();
 
-  aEvent->mReply->mHasSelection = !mSelection->IsCollapsed();
-
   nsRect r;
   nsIFrame* frame = nsCaret::GetGeometry(mSelection, &r);
   if (!frame) {
@@ -1321,7 +1319,7 @@ nsresult ContentEventHandler::OnQuerySelectedText(
   if (!mFirstSelectedRawRange.IsPositioned()) {
     MOZ_ASSERT(aEvent->mInput.mSelectionType != SelectionType::eNormal);
     MOZ_ASSERT(aEvent->mReply->mOffsetAndData.isNothing());
-    MOZ_ASSERT(!aEvent->mReply->mHasSelection);
+    MOZ_ASSERT_IF(mSelection, !mSelection->RangeCount());
     // This is special case that `mReply` is emplaced, but mOffsetAndData is
     // not emplaced but treated as succeeded because of no selection ranges
     // is a usual case.
@@ -2546,7 +2544,7 @@ nsresult ContentEventHandler::OnQuerySelectionAsTransferable(
 
   MOZ_ASSERT(aEvent->mReply.isSome());
 
-  if (!aEvent->mReply->mHasSelection) {
+  if (mSelection->IsCollapsed()) {
     MOZ_ASSERT(!aEvent->mReply->mTransferable);
     return NS_OK;
   }

dom/events/IMEContentObserver.cpp

@@ -607,7 +607,6 @@ nsresult IMEContentObserver::HandleQueryContentEvent(
                                            mSelectionData.String(),
                                            OffsetAndDataFor::SelectedString);
     aEvent->mReply->mContentsRoot = mRootContent;
-    aEvent->mReply->mHasSelection = !mSelectionData.IsCollapsed();
     aEvent->mReply->mWritingMode = mSelectionData.GetWritingMode();
     aEvent->mReply->mReversed = mSelectionData.mReversed;
     MOZ_LOG(sIMECOLog, LogLevel::Debug,

widget/ContentCache.cpp

@@ -688,7 +688,6 @@ bool ContentCacheInParent::HandleQueryContentEvent(
           Substring(mText, mSelection->StartOffset(), mSelection->Length()),
           OffsetAndDataFor::SelectedString);
       aEvent.mReply->mReversed = mSelection->Reversed();
-      aEvent.mReply->mHasSelection = true;
       aEvent.mReply->mWritingMode = mSelection->mWritingMode;
       MOZ_LOG(sContentCacheLog, LogLevel::Info,
               ("0x%p HandleQueryContentEvent(), "

widget/TextEvents.h

@@ -1173,8 +1173,6 @@ class WidgetQueryContentEvent : public WidgetGUIEvent {
     CopyableTArray<mozilla::LayoutDeviceIntRect> mRectArray;
     // true if selection is reversed (end < start)
     bool mReversed;
-    // true if the selection exists
-    bool mHasSelection;
     // true if DOM element under mouse belongs to widget
     bool mWidgetIsHit;
 
@@ -1184,7 +1182,6 @@ class WidgetQueryContentEvent : public WidgetGUIEvent {
           mContentsRoot(nullptr),
           mFocusedWidget(nullptr),
           mReversed(false),
-          mHasSelection(false),
           mWidgetIsHit(false) {}
 
     // Don't allow to copy/move because of `mEventMessage`.
@@ -1272,8 +1269,7 @@ class WidgetQueryContentEvent : public WidgetGUIEvent {
                   << ToString(aReply.mTentativeCaretOffset).c_str() << ", ";
         }
       }
-      aStream << "mHasSelection=" << (aReply.mHasSelection ? "true" : "false");
-      if (aReply.mHasSelection) {
+      if (aReply.mOffsetAndData.isSome() && aReply.mOffsetAndData->Length()) {
         if (aReply.mEventMessage == eQuerySelectedText) {
           aStream << ", mReversed=" << (aReply.mReversed ? "true" : "false");
         }

widget/moz.build

@@ -28,6 +28,9 @@ with Files("*CompositorWidget*"):
 with Files("*ContentData*"):
     BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
 
+with Files("*Events.h"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
 with Files("*FontRange*"):
     BUG_COMPONENT = ("Core", "Widget: Cocoa")
 

widget/tests/window_composition_text_querycontent.xhtml

@@ -203,10 +203,33 @@ function checkSelection(aExpectedOffset, aExpectedText, aMessage, aID)
                                ": synthesizeQuerySelectedText " + aID)) {
     return false;
   }
-  is(selectedText.offset, aExpectedOffset,
-     aMessage + ": selection offset is wrong " + aID);
-  is(selectedText.text, aExpectedText,
-     aMessage + ": selected text is wrong " + aID);
+  if (aExpectedOffset === null) {
+    todo_is(
+      selectedText.notFound,
+      true,
+      `${aMessage}: selection should not be found ${aID}`
+    );
+    return selectedText.notFound;
+  }
+
+  is(
+    selectedText.notFound,
+    false,
+    `${aMessage}: selection should be found ${aID}`
+  );
+  if (selectedText.notFound) {
+    return false;
+  }
+  is(
+    selectedText.offset,
+    aExpectedOffset,
+    `${aMessage}: selection offset should be ${aExpectedOffset} ${aID}`
+  );
+  is(
+    selectedText.text,
+    aExpectedText,
+    `${aMessage}: selected text should be "${aExpectedText}" ${aID}`
+  );
   return selectedText.offset == aExpectedOffset &&
          selectedText.text == aExpectedText;
 }
@@ -4551,18 +4574,54 @@ function runQuerySelectionEventTest()
 
   // #1
   contenteditable.innerHTML = "<br/>a";
-  selection.setBaseAndExtent(contenteditable.firstChild, 0, contenteditable.lastChild, 1);
-  checkSelection(0, kLF + "a", "runQuerySelectionEventTest #1, \"" + contenteditable.innerHTML + "\"");
+  selection.setBaseAndExtent(
+    contenteditable.firstChild,
+    0,
+    contenteditable.lastChild,
+    1
+  );
+  checkSelection(
+    0,
+    `${kLF}a`,
+    `runQuerySelectionEventTest #1, "${contenteditable.innerHTML}"`
+  );
 
   // #2
   contenteditable.innerHTML = "<p></p><p>abc</p>";
-  selection.setBaseAndExtent(contenteditable.firstChild, 0, contenteditable.lastChild.firstChild, 1);
-  checkSelection(kLFLen, kLF + "a", "runQuerySelectionEventTest #2, \"" + contenteditable.innerHTML + "\"");
+  selection.setBaseAndExtent(
+    contenteditable.firstChild,
+    0,
+    contenteditable.lastChild.firstChild,
+    1
+  );
+  checkSelection(
+    kLFLen,
+    `${kLF}a`,
+    `runQuerySelectionEventTest #2, "${contenteditable.innerHTML}"`
+  );
 
   // #3
   contenteditable.innerHTML = "<p>abc</p><p>def</p>";
-  selection.setBaseAndExtent(contenteditable.firstChild, 0, contenteditable.lastChild.firstChild, 1);
-  checkSelection(kLFLen, "abc" + kLF + "d", "runQuerySelectionEventTest #3, \"" + contenteditable.innerHTML + "\"");
+  selection.setBaseAndExtent(
+    contenteditable.firstChild,
+    0,
+    contenteditable.lastChild.firstChild,
+    1
+  );
+  checkSelection(
+    kLFLen,
+    `abc${kLF}d`,
+    `runQuerySelectionEventTest #3, "${contenteditable.innerHTML}"`
+  );
+
+  // #4
+  contenteditable.innerHTML = "<p>abc</p>";
+  selection.removeAllRanges();
+  checkSelection(
+    null,
+    null,
+    `runQuerySelectionEventTest #4, "${contenteditable.innerHTML}"`
+  );
 }
 
 function runQueryIMESelectionTest()