<Swing Dev> RFR: 8196099: javax/swing/text/CSSBorder/6796710/bug6796710.java fails

[Sergey Bylokhov]

This test could fail on windows for two reasons:
 - The window does not fit the small screen, and the robot captures the image outside the screen. Especially if the screen is small but some scale (like 150%) is set.
 - The test paints and captures the button in the frame, then resize the frame and again paint and captures the button. The problem occurs if the fractional scale is used(like 125%), in that case, the button could be shifted by one pixel due to rounding depending on what position it was started to be drawn.

The solution is to always use the same uiscale=1, an updated test still can reproduce the JDK-6796710

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Commit messages:
 - uiscale=2 is too big for some systems
 - Initial fix

Changes: https://git.openjdk.java.net/jdk/pull/950/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=950&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8196099
  Stats: 21 lines in 2 files changed: 15 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/950.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/950/head:pull/950

PR: https://git.openjdk.java.net/jdk/pull/950