Unexpected compound modifier behavior

[jandew42]

I'm not certain this is a bug, (it could be intended behavior) but it's unexpected, and I'm curious why it occurs.

When pressing the following key combinations with plover output disabled:
alt-PrtSc take a screenshot of the current window
ctrl-alt-PrtSc does the same, presumably because Windows ignores the unnecessary ctrl

When making a plover dictionary entry for these bindings, the latter doesn't work. That is:
{#Alt_L(Print)} takes a screenshot of the current window
{#Control_L(Alt_L(Print))} takes a screenshot of the entire screen, same as {#Print} on its own

The expected behavior would be for the last case to behave exactly the same as ctrl-alt-PrtSc and take a screenshot of the current window.

Operating system and hardware

• OS: Windows 10 Home
• Plover: 4.0.0.dev10
• Keyboard: Kumara Redragon K552

[benoit-pierre]

You're using the exact same side for each modifier? Same order for pressing the keys?

[jandew42]

You're using the exact same side for each modifier? Same order for pressing the keys?

yes and yes

[jandew42]

Moreover, the plover-disabled manual combo works irrespective of order (provided the PrtSc is last).

And the manual ctrl-alt-PrtSc behavior described is the behavior whether plover is open or not, and whether plover is disabled or enabled.

[fourshade]

Plover has some known issues with Alt modifiers in Windows, specifically with OS-level shortcuts like Alt-Tab. Poster child of a Heisenbug, that one...debugging an issue with focus switch is rather difficult with debuggers that steal focus on breakpoints.

[user202729]

Alt+tab issue may be #1154 . Try merging the related pull request to see if this issue is also fixed.

If it still doesn't work try applying #1410 (comment) too.