<Swing Dev> [9] Review Request for 8140527: JInternalFrame has incorrect title button width

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8140527
webrev: http://cr.openjdk.java.net/~ssadetsky/8140527/webrev.00/

Title buttons under Widows Classic LnF got their sizes from the XP 
desktop theme in which button width can be bigger than height. The 
proposed fix forces title buttons to be square and to fit the frame 
title in height.