Implement window_start_drag on Windows and Linux.

[bruvzg]

• Follow up to [macOS] Use native window drag for the custom editor title bars. #99642

Implements DisplayServer::window_start_drag for Windows and Linux.

Tested on Windows and X11, and Wayland.

[Riteo]

seems like xdg_toplevel_drag_v1 protocol is not widely supported

xdg_toplevel_drag is for something else (drag 'n' dropping windows, think browser tabs).

xdg_toplevel::move is the proper option. It's an input operation, which needs the latest input serial (I should really make it a generic method).

I can whip up a quick patch tomorrow if you want

[bruvzg]

xdg_toplevel::move is the proper option. It's an input operation, which needs the latest input serial (I should really make it a generic method).

Thanks! This seems to be working, will update PR in a moment.

I should really make it a generic method

Used pointer_data.button_serial, since it will match other platforms (either use or simulate pointer data).

[Riteo]

Wow that was quick! Thank you! I can confirm that this works fine on sway too :D

[Riteo]

Approving from the Wayland side!

[akien-mga]

Thanks!