Bug 1702675 - Demote nsTextFrame selection state assert to NS_ASSERTION r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D111637

layout/generic/nsTextFrame.cpp

@@ -7442,8 +7442,9 @@ bool nsTextFrame::IsFrameSelected() const {
     // Assert that the selection caching works.
     const bool isReallySelected =
         GetContent()->IsSelected(GetContentOffset(), GetContentEnd());
-    MOZ_ASSERT((mIsSelected == nsTextFrame::SelectionState::Selected) ==
-               isReallySelected);
+    NS_ASSERTION((mIsSelected == nsTextFrame::SelectionState::Selected) ==
+                     isReallySelected,
+                 "Should have called InvalidateSelectionState()");
 #endif
   }