hg: jdk/client: 8040630: Popup menus and tooltips flicker with previous popup contents when first shown

[sergey.bylokhov at oracle.com]

Changeset: 2f6ba1720303
Author:    serb
Date:      2020-03-10 13:58 -0700
URL:       https://hg.openjdk.java.net/jdk/client/rev/2f6ba1720303

8040630: Popup menus and tooltips flicker with previous popup contents when first shown
Reviewed-by: kizune, pbansal

! src/java.desktop/share/classes/javax/swing/Popup.java