This fixes a long standing bug with `GridPane` where unmanaged nodes would still result in gaps being added between rows/columns even though nothing is rendered there. Take the following grid where dashes and pipes represent the vgaps and hgaps:
| |0| |1| |--------|---|---|---| |0 |A|||B| | |-|||-| |1 |C|||D| | |-|||-| |2 |E|||F| Now, when both C and D are set to unmanaged (and invisible) the grid will **still** render the gaps: | |0| |1| |--------|---|---|---| |0 |A|||B| | |-|||-| |1 ||||| | |-|||-| |2 |E|||F| Instead it should collapse the gap between row 0 and 2: | |0| |1| |--------|---|---|---| |0 |A|||B| | |-|||-| |2 |E|||F| There are at least two relevant issues in JBS: - A request to let the user show and hide rows and columns: https://bugs.openjdk.org/browse/JDK-8136901 - This can now be done by setting the relevant row/columns items to unmanaged without having to restructure the grid (assuming the complaint was that otherwise there'd be visible extra gaps for each hidden row) - A request for another mode to skip gaps when entire rows/columns are unmanaged: https://bugs.openjdk.org/browse/JDK-8092379 - This should not be a mode, but the standard, as unmanaged nodes should not affect the outcome of the grid layout Screenshots Simple application which can hide row 3: <img width="443" height="491" alt="image" src="https://github.com/user-attachments/assets/0342dba3-cd1c-4d9e-9451-e9c8c628b2e2"; /> Correct behavior when row 3 is hidden: <img width="443" height="408" alt="image" src="https://github.com/user-attachments/assets/c7c54414-6a03-43e4-b733-21d0b251d729"; /> Behavior before this fix (note the double gap **and** extra grid line): <img width="443" height="453" alt="image" src="https://github.com/user-attachments/assets/f357e68a-e950-42e7-890b-91a78e194dd0"; /> ------------- Commit messages: - When all nodes starting in a row or column are unmanaged, skip gap Changes: https://git.openjdk.org/jfx/pull/1990/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1990&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8092379 Stats: 47 lines in 1 file changed: 23 ins; 4 del; 20 mod Patch: https://git.openjdk.org/jfx/pull/1990.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1990/head:pull/1990 PR: https://git.openjdk.org/jfx/pull/1990
