Issue description
Depending on the mouse drag start location and direction the desired area does not get selected (but the old area stays). Extra annoying, when it fails, the MCT dialog closes. Has to be reopened, before another attempt can be made. Both axis, X and Y are affected.
In the following screenshots I dragged from top left to bottom right. See the map orientation on the designated coal mining area. I'm playing 90° rotated (I like the shipyard at bottom).
Fail (have to open the dialog again to retry):

Accepted (results in a 392x392 area):

Top left-bottom right fails. Bottom right-top left fails. the other two seem fine. Error has been around for a long time, but only now I understood enough to have it reproducible.
Expected behavior
The maximum draggable area should be accepted, no matter which of the four corners user starts dragging.
The maximum draggable area should be accepted, no matter if I start on the corner of a yellow/green cell sized square or within.
Dialog should stay open, even if dragging fails. Obsolete complaint if a) & b) fixed, i.e. dragging never fails.
Game version
v0.4.13 (148)
Attachments
save_23-01-21_13-21-06_00050506.save
Files not imported: save_23-01-21_13-21-06_00050506.save