Keyboard shortcuts: support `Ctrl+W` and `Esc` to close sub-windows, and `Ctrl+Q` to quit the app

[nekohayo]

As of version 2.19.2 (from Flathub) and older, I noticed that these somewhat standard GNOME keyboard shortcuts are not really used by the app:

• Ctrl+Q to quit the app
• Ctrl+W to close any window (not just Alt+F4)
• Esc to dismiss/close dialogs (i.e. sub-windows), when there is no focused SearchEntry widget or active popover widget in those windows etc. For example in:
  • Preferences dialog
  • Columns dialog
  • Filters dialog
  • Dialogs from the hamburger menu:
    • Analyze Blame dialog
    • Systemd info ("Unit properties") dialog
    • List Boots dialog
    • Watch signals dialog
    • …
  • The only exceptions where this currently works are the standard GTK/libadwaita dialogs such as the Keyboard Shortcuts dialog and the About dialog ;)

[plrigaux]

Question : Will it be confusing to use Esc for closing a sub window and for also clearing an Entry?

[nekohayo]

I think it won't be a problem, the majority of applications throughout GNOME use that shortcut for both cases within the same application (of course the code itself must not get confused with focus :)

[plrigaux]

It's released in 2.19.3

You can see a case where it can be a collision of the Escape shortcut. Go under the Unit Info Tab -> press Show all properties -> Filter the properties.

Basically, as long you stay on the the search entry the window won't close if you press Escape