fix to text width calculation

now considers new lines to match rendering

src/ol/render/canvas.js

@@ -362,7 +362,9 @@ export function measureAndCacheTextWidth(font, text, cache) {
   if (text in cache) {
     return cache[text];
   }
-  const width = measureTextWidth(font, text);
+  const width = text
+    .split('\n')
+    .reduce((prev, curr) => Math.max(prev, measureTextWidth(font, curr)), 0);
   cache[text] = width;
   return width;
 }