Warn when popping out of empty text style stack

Author: yjbanov

lib/web_ui/lib/src/engine/canvaskit/text.dart

@@ -752,6 +752,12 @@ class CkParagraphBuilder implements ui.ParagraphBuilder {
   void pop() {
     if (_styleStack.length <= 1) {
       // The top-level text style is paragraph-level. We don't pop it off.
+      if (assertionsEnabled) {
+        html.window.console.warn(
+          'Cannot pop text style in ParagraphBuilder. '
+          'Already popped all text styles from the style stack.',
+        );
+      }
       return;
     }
     _commands.add(const _ParagraphCommand.pop());

lib/web_ui/test/canvaskit/canvas_golden_test.dart

@@ -578,7 +578,6 @@ void testMain() {
         'canvaskit_text_styles_do_not_leak.png',
         picture,
         region: ui.Rect.fromLTRB(0, 0, testWidth, 850),
-        write: true,
       );
     });
     // TODO: https://github.com/flutter/flutter/issues/60040