<Swing Dev> RFR: 8268084: [macos] Disabled JMenuItem arrow is not disabled [v2]

[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:

  Cache icon

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5310/files
  - new: https://git.openjdk.java.net/jdk/pull/5310/files/c3510ba1..ba8f30b5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5310&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5310&range=00-01

  Stats: 16 lines in 1 file changed: 10 ins; 4 del; 2 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