Detecting keyUp for modifier keys

Hello,

On 3.9, there's this cute new Morph called WindowSwitcher which implements a Windows-like alt-tab popup for selecting open windows. To activate it, press alt-w.

However, there's a bug.

The pop up will only go away during a keyUp event when neither the control key nor the command key is pressed (see WindowSwitcher>>keyUp:), however, I never see a keyUp event when the command key is released on my machines running Linux. So, for now, you have to do:

alt-w             "activate the pop-up"
w.. w.. w        "pick the window before the one you want"
release alt    "no effect"
w                 "move to the desired window, and close the popup"

Is there a reason why keyUp: is not sent when I release the command key (or control, or shift for that matter)? Is this a VM bug?  If it is, does this mean it is also happening on other platforms?

One other thing I noticed. InputSensor only implements Pressed methods for the modifier keys, but not Released, is that the cause of the problem?

Duncan.

What you describe sounds too much to the WindowSwitcher I made and distribute with the KeyBinder package. If it is that WindowSwitcher which you are refering to, I did it a long time ago, I think for Squeak 3.7, maybe 3.8, but certainly not 3.9. And thats probably the reason why it doesn't work properly now.

BTW,  the KeyBinder package was a proof of concept on some changes I wanted for Squeak for its keyboard focus policy, and the WindowSwitcher was a proof of concept for the KeyBinder in itself :)

P.S: It is possible to change the binding that WindowSwitcher use, you just need to do it from the KeyBinder UI.

Either way, it seems to work quite well, except for this bug. If there is indeed no way of detecting a keyup event for any of the modifier keys, then I think it's a pretty major deficiency of Squeak's keyboard event handling system.