Bug 1623333: part 3) Assert `EditorBase::SelectionRefPtr` has type `eNormal`. r=masayuki

Simplifies reasoning about it.

Differential Revision: https://phabricator.services.mozilla.com/D67444

--HG--
extra : moz-landing-system : lando

editor/libeditor/EditorBase.cpp

@@ -6096,6 +6096,9 @@ EditorBase::AutoEditActionDataSetter::AutoEditActionDataSetter(
   // If we're nested edit action, copies necessary data from the parent.
   if (mParentData) {
     mSelection = mParentData->mSelection;
+    MOZ_ASSERT(!mSelection ||
+               (mSelection->GetType() == SelectionType::eNormal));
+
     // If we're eNotEditing, we should inherit the parent's edit action.
     // This may occur if creator or its callee use public methods which
     // just returns something.
@@ -6115,6 +6118,9 @@ EditorBase::AutoEditActionDataSetter::AutoEditActionDataSetter(
     if (NS_WARN_IF(!mSelection)) {
       return;
     }
+
+    MOZ_ASSERT(mSelection->GetType() == SelectionType::eNormal);
+
     mEditAction = aEditAction;
     mDirectionOfTopLevelEditSubAction = eNone;
     if (mEditorBase.mIsHTMLEditorClass) {

editor/libeditor/EditorBase.h

@@ -874,7 +874,13 @@ class EditorBase : public nsIEditor,
 
     bool IsCanceled() const { return mBeforeInputEventCanceled; }
 
-    const RefPtr<Selection>& SelectionRefPtr() const { return mSelection; }
+    const RefPtr<Selection>& SelectionRefPtr() const {
+      MOZ_ASSERT(!mSelection ||
+                 (mSelection->GetType() == SelectionType::eNormal));
+
+      return mSelection;
+    }
+
     nsIPrincipal* GetPrincipal() const { return mPrincipal; }
     EditAction GetEditAction() const { return mEditAction; }
 
@@ -1040,6 +1046,8 @@ class EditorBase : public nsIEditor,
     }
 
     void UpdateSelectionCache(Selection& aSelection) {
+      MOZ_ASSERT(aSelection.GetType() == SelectionType::eNormal);
+
       AutoEditActionDataSetter* actionData = this;
       while (actionData) {
         if (actionData->mSelection) {
@@ -1217,6 +1225,9 @@ class EditorBase : public nsIEditor,
    */
   const RefPtr<Selection>& SelectionRefPtr() const {
     MOZ_ASSERT(mEditActionData);
+    MOZ_ASSERT(mEditActionData->SelectionRefPtr()->GetType() ==
+               SelectionType::eNormal);
+
     return mEditActionData->SelectionRefPtr();
   }