Tool window dragging problematic on Linux

[Tristan Croll]

(In Linux - haven't confirmed for other OSes).

This seems to be a new behaviour. If I open a floating tool window (e.g. the shell) and start dragging it with the mouse, if I drag upwards at more than a snail's pace the mouse cursor jumps away from the window and the window stops moving. If I then bring my mouse back over the title bar of the window with the cursor released, the window will start following the mouse again, and only stops if I click on the title bar. Seems to be specific to tool windows - the main window still behaves fine. A small thing, but it becomes really frustrating really quickly.

[Tristan Croll]

Another clue: If I tear away a docked tool (e.g. the ModelPanel), then as long as I don't release the mouse button I can drag it around as fast and hard as I like, and it follows obediently. But if I drop it and then pick it up again, I get the same pathology - any fast mouse movement and it loses focus.

[Eric Pettersen]

I can reproduce this behavior on an Ubuntu system. It doesn't happen on a Mac. We don't do anything custom as far as window dragging goes, so this is a new Qt problem. We just have to hope that newer releases fix it, though we could file a Qt bug report. Assigning to Greg since he's the one that installs new releases and also since he has a Linux system on his desk so it's easier for him to test.

[Tom Goddard]

Also does not happen on Windows 10 with today's ChimeraX build.

[Greg Couch]

Appears to be fixed with Qt 5.9.5.