surface: add wlr_surface.previous

1 files changed, 3 insertions, 2 deletions

diff --git a/include/wlr/types/wlr_surface.h b/include/wlr/types/wlr_surface.h
index a587e7bc..76f09cc6 100644
--- a/include/wlr/types/wlr_surface.h
+++ b/include/wlr/types/wlr_surface.h
@@ -64,9 +64,10 @@ struct wlr_surface {
 	/**
 	 * `current` contains the current, committed surface state. `pending`
 	 * accumulates state changes from the client between commits and shouldn't
-	 * be accessed by the compositor directly.
+	 * be accessed by the compositor directly. `previous` contains the state of
+	 * the previous commit.
 	 */
-	struct wlr_surface_state current, pending;
+	struct wlr_surface_state current, pending, previous;
 	const char *role; // the lifetime-bound role or null
 
 	struct {