<Swing Dev> [14] RFR JDK-8221903:PIT: javax/swing/RepaintManager/IconifyTest/IconifyTest.java fails on ubuntu18.04

[Prasanta Sadhukhan]

Hi All,

Please review a test fix for an issue seen to be failing in PIT whereby 
the frame which is to iconified returns uniconified state when checked.

Issue is because of the timing whereby the frame iconification state 
check happens quickly after iconification.

Proposed fix is to introduce some delay and it passes in mach5 (link in 
JBS).

Bug: https://bugs.openjdk.java.net/browse/JDK-8221903

webrev: http://cr.openjdk.java.net/~psadhukhan/8221903/webrev.0/

Regards

Prasanta