RFR: 8158801: [TEST_BUG] Mixing tests fail because of focus workaround trick [v28]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 43 additional commits since the last revision:

 - Merge branch 'openjdk:master' into jdk-8158801
 - Disposes frames after each AWT component test
 - Removes redundant code for centring frames
 - Merge branch 'openjdk:master' into jdk-8158801
 - Merge branch 'openjdk:master' into jdk-8158801
 - Centers missed frames in the middle of screen
 - Uses KeyboardFocusManager instead of FocusManager
 - Reverted not needed changes
 - Updates copyright years
 - Merge branch 'openjdk:master' into jdk-8158801
 - ... and 33 more: https://git.openjdk.org/jdk/compare/df6157fc...c7e56eeb

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25971/files
  - new: https://git.openjdk.org/jdk/pull/25971/files/a1788ae0..c7e56eeb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25971&range=27
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25971&range=26-27

  Stats: 15139 lines in 364 files changed: 11479 ins; 2187 del; 1473 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