Only redraw once after scaling every widget eclipse-platform#62

This commit contributes to reducing the number of redraws and only draw
once all the widgets have performed scaling using their
Widget:handleDpiChange handlers.

contributes to
eclipse-platform#62 and
eclipse-platform#128

Author: amartya4256

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Composite.java

@@ -1984,6 +1984,5 @@ private static void handleDPIChange(Widget widget, int newZoom, float scalingFac
 	for (Control child : composite.getChildren()) {
 		DPIZoomChangeRegistry.applyChange(child, newZoom, scalingFactor);
 	}
-	composite.redrawInPixels (null, true);
 }
 }