<Swing Dev> [14] RFR JDK-8229935:[TEST_BUG]: bug8132119.java inconsistently positions text

[Prasanta Sadhukhan]

Hi All,

Please review a test fix for an  test issue seen primarily in linux.

The test draws "AOB" with and without underline underneath and then 
looks to try to calculate the midpoint of "O" and then expects to see 
the transition
from top to bottom of bg->fg->bg->fg->bg as you get when you cross the 
path of the O twice. When there is underline, it expects 6 transition 
from top of O till it passes the underline in form of 
bg->fg->bg->fg->bg->fg->bg

as it apparently assumes that there is at least a pixel gap between 
lower curvature of O to underline. This may not be true for all fonts, 
so sometimes underline are stuck with the lower part of O and it fails.

Proposed fix is to calculate the transition from 10 pixel left from 
midpoint of "O" so that there is at least some pixels gap between 
curvature of O and underline.

Also, the text is drawn in aliased mode to avoid the antialias zigzag to 
be mistakenly construed as "transition".

Proposed fix pass in all platforms and the mach5 job link is present in JBS.

Bug:https://bugs.openjdk.java.net/browse/JDK-8229935

webrev: http://cr.openjdk.java.net/~psadhukhan/8229935/webrev.0/

Regards
Prasanta