This is an alternative to #1789 with focus on bug fixing. Reverts the replacement of `GtkWindow` with `GdkWindow`, restoring the original approach to reduce risk and ease review.
Additional testing on other OS versions and manual validation is in progress. ------------- Commit messages: - Use the default width/height if bounds not set - Merge branch 'master' into 8354943_less_changes - 8354943: [Linux] Simplify and update glass gtk backend: window sizing, positioning, and state management issues Changes: https://git.openjdk.org/jfx/pull/2139/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2139&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8354943 Stats: 4731 lines in 27 files changed: 3346 ins; 811 del; 574 mod Patch: https://git.openjdk.org/jfx/pull/2139.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2139/head:pull/2139 PR: https://git.openjdk.org/jfx/pull/2139
