Bug 1633448: part 10) Add `StyledRanges::Clear`. r=hsivonen

Differential Revision: https://phabricator.services.mozilla.com/D73433

dom/base/Selection.cpp

@@ -1115,7 +1115,7 @@ nsresult Selection::Clear(nsPresContext* aPresContext) {
   for (uint32_t i = 0; i < mStyledRanges.Length(); ++i) {
     SelectFrames(aPresContext, mStyledRanges.mRanges[i].mRange, false);
   }
-  mStyledRanges.mRanges.Clear();
+  mStyledRanges.Clear();
 
   // Reset direction so for more dependable table selection range handling
   SetDirection(eDirNext);
@@ -1758,6 +1758,8 @@ void Selection::StyledRanges::UnregisterSelection() {
   }
 }
 
+void Selection::StyledRanges::Clear() { mRanges.Clear(); }
+
 StyledRange* Selection::StyledRanges::FindRangeData(nsRange* aRange) {
   NS_ENSURE_TRUE(aRange, nullptr);
   for (uint32_t i = 0; i < mRanges.Length(); i++) {

dom/base/Selection.h

@@ -756,6 +756,8 @@ class Selection final : public nsSupportsWeakReference,
   void Disconnect();
 
   struct StyledRanges {
+    void Clear();
+
     StyledRange* FindRangeData(nsRange* aRange);
 
     using Elements = AutoTArray<StyledRange, 1>;