Paint all backgrounds first to prevent overlap (#7287)

third_party/txt/src/txt/paragraph.cc

@@ -923,6 +923,11 @@ sk_sp<SkTypeface> Paragraph::GetDefaultSkiaTypeface(const TextStyle& style) {
 void Paragraph::Paint(SkCanvas* canvas, double x, double y) {
   SkPoint base_offset = SkPoint::Make(x, y);
   SkPaint paint;
+  // Paint the background first before painting any text to prevent
+  // potential overlap.
+  for (const PaintRecord& record : records_) {
+    PaintBackground(canvas, record, base_offset);
+  }
   for (const PaintRecord& record : records_) {
     if (record.style().has_foreground) {
       paint = record.style().foreground;
@@ -931,7 +936,6 @@ void Paragraph::Paint(SkCanvas* canvas, double x, double y) {
       paint.setColor(record.style().color);
     }
     SkPoint offset = base_offset + record.offset();
-    PaintBackground(canvas, record, base_offset);
     PaintShadow(canvas, record, offset);
     canvas->drawTextBlob(record.text(), offset.x(), offset.y(), paint);
     PaintDecorations(canvas, record, base_offset);