tab-line tabs disappear on floating window when moved #189
Description
If I have tab-line mode enabled, then even floating windows have a tab-line at the top. (that seems weird in itself, but anyway...)
If I move that floating window with s-button1, mouse, then the tab line disappears, the whole window shifts up and there's an empty black bar at the bottom between the window contents and the mode line. When I set it back down the black bar disappears and the tab bar reappears.
If I bind keys to moving the window it's even worse, the tab line disappears permanently, and the black bar between the window contents and the mode line stays permanently.
Clearly some code in the move window logic does not take into account the possibility that there could be a tab line. Of course having a tab line there is of dubious utility, but if it's going to be there it should work correctly.