RFR: 8268145: [macos] Rendering artifacts is seen when text inside the JTable with TableCellEditor having JTextfield

[Prasanta Sadhukhan]

When a textfield is embedded in a TableCellEditor in a JTable in Aqua L&F and space is entered and caret moved back and forth by pressing left/right arrow button, an artifact is seen, which is basically the caret is not properly repainted leaving behind its trails.

When caret is moved, it is repainted every time by "damaging" the area surrounding the caret to cause it to be repainted in a new location. AquaCaret overrides the default "damage" code to intersect the caret area with the border insets so that it does not damage the AquaBorder area..
For TextField case, AquaTextFieldBorder insets is removed from AquaTextField and then intersected with AquaCaret to get the dirry region which is then repainted, so as to not damage the border but it is done irrespective of whether border is shown or not, so proper dirty region is not repainted leaving behind artifacts when the caret is moved around...

Fix is to see if border to be painted is not opaque in which case the proper dirty region is calculated which is then used in repaint logic to repaint the component..

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Commit messages:
 - jcheck
 - 8268145: [macos] Rendering artifacts is seen when text inside the JTable with TableCellEditor having JTextfield

Changes: https://git.openjdk.org/jdk/pull/22416/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22416&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8268145
  Stats: 103 lines in 2 files changed: 95 ins; 4 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/22416.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22416/head:pull/22416

PR: https://git.openjdk.org/jdk/pull/22416