The ::show-completion signal is a key binding signal which gets
emitted when the user requests a completion, by pressing
<keycombo><keycap>Control</keycap><keycap>space</keycap></keycombo>.
Applications should not connect to it, but may emit it with
gobject.global.signalEmitByName if they need to activate the completion by
another means, for example with another key binding or a menu entry.
Connect to ShowCompletion signal.
The ::show-completion signal is a key binding signal which gets emitted when the user requests a completion, by pressing <keycombo><keycap>Control</keycap><keycap>space</keycap></keycombo>.
This will create a #GtkSourceCompletionContext with the activation type as gtksource.types.CompletionActivation.UserRequested.
Applications should not connect to it, but may emit it with gobject.global.signalEmitByName if they need to activate the completion by another means, for example with another key binding or a menu entry.