Emitted to select all children of the box, if the selection mode permits it.
This is a keybinding signal.
The default binding for this signal is <kbd>Ctrl</kbd>-<kbd>a</kbd>.
See Implementation
Emitted to select all children of the box, if the selection mode permits it.
This is a keybinding signal.
The default binding for this signal is <kbd>Ctrl</kbd>-<kbd>a</kbd>.