[3.x] Improved region-select in the 3D editor viewport

[mbrlabs]

Enable region-select when dragging the mouse. Previously this was only possible when the mouse was not over a mesh.

• This is a backport of Improved region-select in the 3D editor viewport #57847
• Also includes this fix: Fixed issues with 3D region-select in the editor #57919

[akien-mga]

Thanks!

[lentsius-bark]

@mbrlabs just noticed this got merged, and really wanted to reach out to thank you for this! Having been using the 3d side of godot, this has been a thing I wished was there for quite a while. You've really made my day better and have improved the workflow for much of the userbase. Thank you!

[mbrlabs]

@lentsius-bark Aww thank you for the kind words, really appreciate it :)

this has been a thing I wished was there for quite a while

Yeah, same. You can also deselect nodes with ESC now (see #58253), which is also very useful.