RFR: 8367376: Bad ButtonUI prevents other components from updating when system changes desktop properties [v7]

[Jeremy Wood]

> Previously:
> 
> If DesktopProperty#updateAllUIs threw an exception, we would never reset the update-pending property to false. This means any subsequent call to `updateUI()` would not attempt to call `updateAllUIs()`
> 
> With this change:
> Subsequent calls to DesktopProperty#updateUI() can still trigger at least one call to updateAllUIs().

Jeremy Wood has updated the pull request incrementally with one additional commit since the last revision:

  8367376: adding missing UIManager import
  
  This is in response to:
  https://git.openjdk.org/jdk/pull/27205#discussion_r2409647336

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27205/files
  - new: https://git.openjdk.org/jdk/pull/27205/files/1b669f8d..d93815c9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27205&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27205&range=05-06

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27205.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27205/head:pull/27205

PR: https://git.openjdk.org/jdk/pull/27205