RFR: 8268084: [macos] Disabled JMenuItem arrow is not disabled [v6]

[Prasanta Sadhukhan]

> It is seen in macos disabled JMenuItem arrow is not disabled even though JMenuItem itself is disabled.
> In native app, same menuitem arrow is disabled for disabled menuitem.
> 
> Issue is when AquaMenuPainter#paintMenuItem() is called, it tries to draw a ImageIcon image of the arrow via ImageIcon#paintIcon which tries to generate MultiResolutionCachedImage via getResolutionVariant() by calling AquaUtils#generateFilteredImage.
> It does not take into account if disabled arrow icon image needs to be drawn or not, so it is always enabled.
> 
> Proposed fix is to generate a disabled ImageIcon image of the same arrow icon and use it for disabled state.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Address review comment

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5310/files
  - new: https://git.openjdk.java.net/jdk/pull/5310/files/3c2f69fa..4f555095

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5310&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5310&range=04-05

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5310.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5310/head:pull/5310

PR: https://git.openjdk.java.net/jdk/pull/5310