Implement and document `move [to] scratchpad`

sway/commands/move.c

@@ -120,7 +120,7 @@ struct cmd_results *cmd_move(int argc, char **argv) {
 			swayc_t *workspace = swayc_parent_by_type(view, C_WORKSPACE);
 			move_workspace_to(workspace, output);
 		}
-	} else if (strcasecmp(argv[0], "scratchpad") == 0) {
+	} else if (strcasecmp(argv[0], "scratchpad") == 0 || (strcasecmp(argv[0], "to") == 0 && strcasecmp(argv[1], "scratchpad") == 0)) {
 		// move scratchpad ...
 		if (view->type != C_CONTAINER && view->type != C_VIEW) {
 			return cmd_results_new(CMD_FAILURE, "move scratchpad", "Can only move containers and views.");

sway/sway.5.txt

@@ -118,6 +118,9 @@ They are expected to be used with **bindsym** or at runtime through **swaymsg**(
 	Moves the focused container or workspace to the output identified by _name_ or
 	_direction_. _direction_ may be one of _up_, _down_, _left_, _right_.
 
+**move** [to] scratchpad::
+	Moves the focused window to the scratchpad.
+
 **reload**::
 	Reloads the sway config file without restarting sway.