commands: Learn mouse_warping.

Place mouse at center of focused view when changing to a workspace on a
different output, if option is enabled. (This replicates existing i3
option.)

This can be triggered in multiple ways:
A) via `workspace <name>` which changes output
B) via `focus <direction>` which changes output
C) via `focus output <name>` which (obviously) changes output

include/commands.h

@@ -2,6 +2,7 @@
 #define _SWAY_COMMANDS_H
 #include <stdbool.h>
 #include <json-c/json.h>
+#include <wlc/wlc.h>
 #include "config.h"
 
 

include/input_state.h

@@ -66,6 +66,7 @@ extern struct pointer_state {
 } pointer_state;
 
 void pointer_position_set(struct wlc_origin *new_origin, bool force_focus);
+void center_pointer_on(swayc_t *view);
 
 // on button release unset mode depending on the button.
 // on button press set mode conditionally depending on the button