workspace: Add setting to make dock resize apply to all panels (#30551)

Re: #19015
Close #12667

When dragging a dock’s resize handle, only the active panel grows or
shrinks. This patch introduces an opt-in behaviour that lets users
resize every panel hosted by that dock at once.

Release Notes:

- Added new `resize_all_panels_in_dock` setting to optionally resize
every panel in a dock together.

Co-authored-by: Mikayla Maki <mikayla@zed.dev>
8c1b549683Aaron Ruan committed on 6/4/2025, 5:40:35 PM· committed by GitHubparentff6ac60
4 files changedLine totals unavailable