RFR: 8216471: GTK LnF: Frame is clipped and does not show JTable,Tooltip and JTree demo in SwingSet2 demo [v3]

[Abhishek Kumar]

> The issue is due to the preferred width of the toggle button in GTK L&F for GTK3 only.
> Comparing the preferred width of toggle button with GTK2 or other LAF, it is much higher in GTK3. The difference is due to the insets value in GTK3.
> 
> In SwingSet2 demo there are as many as 16 demos are added in toolbar and the preferred width of frame is set to 720px.
> In GTK L&F (For GTK3), overall preferred width of toolbar is ~980 px which is more than frame width and that results in the clipping of last few demos.
> In other L&F and GTK2, the preferred width of toolbar is less than frame width. Hence, there is no clipping.
> 
> The proposed solution is to increase the width and height of SwingSet2 demo frame.

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

  Panel size updated to avoid clipping in Java L&F

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20052/files
  - new: https://git.openjdk.org/jdk/pull/20052/files/5a4ee3ce..04ecceeb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20052&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20052&range=01-02

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20052.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20052/head:pull/20052

PR: https://git.openjdk.org/jdk/pull/20052