[9] Review Request for 8078483: Apparent endless loop running JEditorPanePaintTest

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
webrev: http://cr.openjdk.java.net/~ssadetsky/8078483/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8078483

***ROOT CASE
Text component root view should receive the component dimension without 
margins.
The caret margin introduced in 
https://bugs.openjdk.java.net/browse/JDK-6866751 fix was not taken into 
account.

***SOLUTION
Extract caret margin from the dimension width.

***TESTING
No extra test is needed. This is a reg test failure issue.

--Semyon