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The redraw procedure was allowed to run after a window was destroyed.

Partially addresses #18

Gsettings controls keyboard layouts

Closes #7

See merge request !25

Keymaps used by the virtual-keyboard protocol will now be changed whenever the keyboard layout changes. That allows for the symbols on the keys to match what the virtual-keyboard protocol produces.

This change adds "level 4" modifiers, normally resulting from combining AltGr and Shift. Because not all layouts need 4 levels, the key handling procedure becomes aware of the current layout. The added level can be accessed by pressing the AltGr key twice.

The change simplifies `label_from_key` calls in one go.

Fixes the bad generation of CTRL modifier.

Added Polish text-input layout to be able to see the change. The new layout does not have a new key map.

Switched main loop to glib

See merge request !24

Switched the dbus object implementation in one go, as it's easier and more useful than making sd-bus work with glib.

Hide the keyboard instead of making it small.

See merge request !22

- warnings
- stack protector
- C standard GNU11

Bool is not int

See merge request !20

Otherwise we crash like

    !18 (comment 7906)

Added object: /sm/puri/OSK0 sm.puri.OSK0
with the requests SetVisible(bool) -> (), GetVisible() -> (bool),
and a notifying property Visible:bool

Register in GNOME session manager

See merge request !17

ci: Don't download wayland-1.16

See merge request !19

Autostart

See merge request !13

Same as ci MR yesterday but this time against master

See merge request !16

Remove unneeded data

See merge request !15