crash "Could not grab modal"

[joeyh]

Describe the bug

Paperwm crashes with "Could not grab modal" and I have to restart gnome shell in order to switch between windows.

Here's the top lines from journalctl --user after the crash:

Jan 24 13:25:43 darkstar alacritty[3796845]: ../../../../modules/im/ximcp/imDefLkup.c,419: The application disposed a key event with 133011 serial.
Jan 24 13:25:41 darkstar gnome-shell[1814058]: JS ERROR: Error: Could not grab modal
                                               ActionDispatcher@file:///home/joey/.local/share/gnome-shell/extensions/paperwm@paperwm.github.com/navigator.js:88:19
                                               getActionDispatcher@file:///home/joey/.local/share/gnome-shell/extensions/paperwm@paperwm.github.com/navigator.js:521:18
                                               preview_navigate@file:///home/joey/.local/share/gnome-shell/extensions/paperwm@paperwm.github.com/navigator.js:548:39
                                               asKeyHandler/<@file:///home/joey/.local/share/gnome-shell/extensions/paperwm@paperwm.github.com/keybindings.js:368:51
                                               @resource:///org/gnome/shell/ui/init.js:21:20
Jan 24 13:25:41 darkstar gnome-shell[1814058]: Failed to grab modal

To Reproduce

I don't have a reliable way to cause this crash, but I have seen it repeatedly when all I have open is some alacritty windows, probably fullscreen, and am switching back and forth between them using paperwm hotkeys.

System information:
Distribution: Debian GNU/Linux
GNOME Shell: 47.3
Display server: Xorg
PaperWM version: 47.1.0
Enabled extensions:

• netspeedsimplified@prateekmedia.extension
• executor@raujonas.github.io
• just-perfection-desktop@just-perfection
• paperwm@paperwm.github.com
• battery-usage-wattmeter@halfmexicanhalfamazing.gmail.com
• drive-menu@gnome-shell-extensions.gcampax.github.com