Bug 1632425 - Part 2: Mark const methods as such r=masayuki

Depends on D77812

Differential Revision: https://phabricator.services.mozilla.com/D77942

dom/events/UIEvent.cpp

@@ -133,7 +133,7 @@ void UIEvent::InitUIEvent(const nsAString& typeArg, bool canBubbleArg,
 }
 
 already_AddRefed<nsIContent> UIEvent::GetRangeParentContentAndOffset(
-    int32_t* aOffset) {
+    int32_t* aOffset) const {
   if (NS_WARN_IF(!mPresContext)) {
     return nullptr;
   }

dom/events/UIEvent.h

@@ -85,7 +85,7 @@ class UIEvent : public Event {
    * nullptr, you should use GetRangeParentContent() instead.
    */
   MOZ_CAN_RUN_SCRIPT already_AddRefed<nsIContent>
-  GetRangeParentContentAndOffset(int32_t* aOffset);
+  GetRangeParentContentAndOffset(int32_t* aOffset) const;
 
   /**
    * If you also need to compute range parent in C++ code, you should use

editor/libeditor/EditorBase.cpp

@@ -4692,7 +4692,7 @@ bool EditorBase::IsActiveInDOMWindow() const {
   return SameCOMIdentity(content, piTarget);
 }
 
-bool EditorBase::IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) {
+bool EditorBase::IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) const {
   // If the event is trusted, the event should always cause input.
   if (NS_WARN_IF(!aGUIEvent)) {
     return false;

editor/libeditor/EditorBase.h

@@ -565,7 +565,7 @@ class EditorBase : public nsIEditor,
    * i.e., The aGUIEvent should be handled by another inner editor or ancestor
    * elements.
    */
-  virtual bool IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent);
+  virtual bool IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) const;
 
   /**
    * FindSelectionRoot() returns a selection root of this editor when aNode

editor/libeditor/HTMLEditor.cpp

@@ -6132,7 +6132,7 @@ bool HTMLEditor::OurWindowHasFocus() const {
   return ourWindow == focusedWindow;
 }
 
-bool HTMLEditor::IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) {
+bool HTMLEditor::IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) const {
   if (!EditorBase::IsAcceptableInputEvent(aGUIEvent)) {
     return false;
   }

editor/libeditor/HTMLEditor.h

@@ -171,7 +171,7 @@ class HTMLEditor final : public TextEditor,
   virtual bool IsActiveInDOMWindow() const override;
   virtual dom::EventTarget* GetDOMEventTarget() const override;
   virtual Element* FindSelectionRoot(nsINode* aNode) const override;
-  virtual bool IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) override;
+  virtual bool IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent) const override;
   virtual nsresult GetPreferredIMEState(widget::IMEState* aState) override;
 
   /**