For the 1st problem, now we only use the border we implemented, so the outer border (Linux system standard border) is not existed anymore, only the inner border exists for new versions. So this problem will not happen in new versions.

For the 2nd problem, it's fixed at resivion#67313,  the cursor will no changing during resizing.

For the 3rd problem, at revision#67313, when resizing, we make sure undocked window position not changed.

So, they are all fixed now. ;) Thanks for your report.