Sets whether or not to enable undoable actions in the text buffer.
If enabled, the user will be able to undo the last number of actions
up to [method@Gtk.TextBuffer.get_max_undo_levels].
See [method@Gtk.TextBuffer.begin_irreversible_action] and
[method@Gtk.TextBuffer.end_irreversible_action] to create
changes to the buffer that cannot be undone.
Sets whether or not to enable undoable actions in the text buffer.
If enabled, the user will be able to undo the last number of actions up to [method@Gtk.TextBuffer.get_max_undo_levels].
See [method@Gtk.TextBuffer.begin_irreversible_action] and [method@Gtk.TextBuffer.end_irreversible_action] to create changes to the buffer that cannot be undone.