RFR: JDK-8290469: Add new positioning options to PassFailJFrame test framework [v11]

[Prasanta Sadhukhan]

On Mon, 22 Aug 2022 22:32:50 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> Additional position setting (TOP_LEFT_CORNER) and a method to obtain bounds of test instruction frame are added to PassFailJFrame to handle positioning of multiple test frames.
>> 
>> In scenarios where multiple test windows might be present, the test windows might overlap the instruction frame. In order to fix this TOP_LEFT_CORNER position option is added that positions the test instruction frame at top left corner with main test window below it.
>> 
>> Additionally `getInstructionFrameBounds()` is added to obtain the position and dimensions of test instruction frame.
>
> Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   minor change to positionTestWindow javadoc

test/jdk/java/awt/regtesthelpers/PassFailJFrame.java line 268:

> 266:      * is null, only the instruction frame is positioned according to
> 267:      * {@code position} parameter. This method should be called before making
> 268:      * the test window visible.

Since this condition is documented, should we also implement check to handle it by calling isShowing() and throw some warning/exception if its visible.
We do the opposite for getLocationOnScreen() where we throw exception if the compoment is not showing.

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PR: https://git.openjdk.org/jdk/pull/9525