RFR: 8158801: [TEST_BUG] Mixing tests fail because of focus workaround trick [v24]

[Khalid Boulanouare]

> Many Mixing tests failed because the work around click lands on the minimizing area in the window control and causes the tests to fail.
> 
> This fix changes the width of base frames which allows most of tests to pass.

Khalid Boulanouare has updated the pull request incrementally with two additional commits since the last revision:

 - Uses KeyboardFocusManager instead of FocusManager
 - Reverted not needed changes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25971/files
  - new: https://git.openjdk.org/jdk/pull/25971/files/ffbe6963..449c397e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25971&range=23
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25971&range=22-23

  Stats: 4 lines in 2 files changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25971.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25971/head:pull/25971

PR: https://git.openjdk.org/jdk/pull/25971