Merge pull request #2299 from splitice/exp/reduce-paints

add paint fast path for when text does not change

Author: Clooos

src/tools/text-scrolling.js

@@ -103,7 +103,9 @@ export function applyScrollingEffect(context, element, text) {
     const { scrolling_effect: scrollingEffect = true } = context.config;
 
     if (!scrollingEffect) {
-        applyNonScrollingStyle(element, text);
+        if (element.previousText !== text || scrollState.has(element)) {
+            applyNonScrollingStyle(element, text);
+        }
         if (resizeObs) try { resizeObs.unobserve(element); } catch (e) {}
         if (intersectionObs) try { intersectionObs.unobserve(element); } catch (e) {}
         scrollState.delete(element);