RFR: 8267582: BasicLookAndFeel should not call getComponentPopupMenu twice to get a popup menu [v3]

[SWinxy]

> Please review this small change to cache a component's popup menu in BLAF.

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

  order imports

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12017/files
  - new: https://git.openjdk.org/jdk/pull/12017/files/37746f07..0abf6066

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12017&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12017&range=01-02

  Stats: 48 lines in 1 file changed: 19 ins; 18 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/12017.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12017/head:pull/12017

PR: https://git.openjdk.org/jdk/pull/12017