Take line number updates into account when bailing early from updateDisplay

Issue #2638

Author: marijnh

lib/codemirror.js

@@ -608,6 +608,7 @@
 
     // Bail out if the visible area is already rendered and nothing changed.
     if (!forced && visible.from >= display.viewFrom && visible.to <= display.viewTo &&
+        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
         countDirtyView(cm) == 0)
       return;