Wayland: Fix error spam when interacting with decorations

Also tried to make tablet handling a bit tidier (less whitespace).

That said I'll uniform tablet handling better once we're back in the dev
cycle.

platform/linuxbsd/wayland/wayland_thread.cpp

@@ -2047,6 +2047,11 @@ void WaylandThread::_wp_relative_pointer_on_relative_motion(void *data, struct z
 	SeatState *ss = (SeatState *)data;
 	ERR_FAIL_NULL(ss);
 
+	if (!ss->pointed_surface) {
+		// We're probably on a decoration or some other third-party thing.
+		return;
+	}
+
 	PointerData &pd = ss->pointer_data_buffer;
 
 	WindowState *ws = wl_surface_get_window_state(ss->pointed_surface);
@@ -2249,13 +2254,11 @@ void WaylandThread::_wp_tablet_tool_on_done(void *data, struct zwp_tablet_tool_v
 
 void WaylandThread::_wp_tablet_tool_on_removed(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
 
 	SeatState *ss = wl_seat_get_seat_state(ts->wl_seat);
-
 	if (!ss) {
 		return;
 	}
@@ -2275,14 +2278,17 @@ void WaylandThread::_wp_tablet_tool_on_removed(void *data, struct zwp_tablet_too
 }
 
 void WaylandThread::_wp_tablet_tool_on_proximity_in(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t serial, struct zwp_tablet_v2 *tablet, struct wl_surface *surface) {
-	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
+	if (!surface || !wl_proxy_is_godot((struct wl_proxy *)surface)) {
+		// We're probably on a decoration or something.
+		return;
+	}
 
+	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
 	if (!ts) {
 		return;
 	}
 
 	SeatState *ss = wl_seat_get_seat_state(ts->wl_seat);
-
 	if (!ss) {
 		return;
 	}
@@ -2304,13 +2310,12 @@ void WaylandThread::_wp_tablet_tool_on_proximity_in(void *data, struct zwp_table
 
 void WaylandThread::_wp_tablet_tool_on_proximity_out(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
-	if (!ts) {
+	if (!ts || !ts->data_pending.proximal_surface) {
+		// Not our stuff, we don't care.
 		return;
 	}
 
 	SeatState *ss = wl_seat_get_seat_state(ts->wl_seat);
-
 	if (!ss) {
 		return;
 	}
@@ -2331,7 +2336,6 @@ void WaylandThread::_wp_tablet_tool_on_proximity_out(void *data, struct zwp_tabl
 
 void WaylandThread::_wp_tablet_tool_on_down(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t serial) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
@@ -2349,7 +2353,6 @@ void WaylandThread::_wp_tablet_tool_on_down(void *data, struct zwp_tablet_tool_v
 
 void WaylandThread::_wp_tablet_tool_on_up(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
@@ -2365,11 +2368,15 @@ void WaylandThread::_wp_tablet_tool_on_up(void *data, struct zwp_tablet_tool_v2
 
 void WaylandThread::_wp_tablet_tool_on_motion(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, wl_fixed_t x, wl_fixed_t y) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
 
+	if (!ts->data_pending.proximal_surface) {
+		// We're probably on a decoration or some other third-party thing.
+		return;
+	}
+
 	WindowState *ws = wl_surface_get_window_state(ts->data_pending.proximal_surface);
 	ERR_FAIL_NULL(ws);
 
@@ -2386,7 +2393,6 @@ void WaylandThread::_wp_tablet_tool_on_motion(void *data, struct zwp_tablet_tool
 
 void WaylandThread::_wp_tablet_tool_on_pressure(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t pressure) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
@@ -2400,7 +2406,6 @@ void WaylandThread::_wp_tablet_tool_on_distance(void *data, struct zwp_tablet_to
 
 void WaylandThread::_wp_tablet_tool_on_tilt(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, wl_fixed_t tilt_x, wl_fixed_t tilt_y) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
@@ -2425,7 +2430,6 @@ void WaylandThread::_wp_tablet_tool_on_wheel(void *data, struct zwp_tablet_tool_
 
 void WaylandThread::_wp_tablet_tool_on_button(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t serial, uint32_t button, uint32_t state) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
@@ -2461,13 +2465,11 @@ void WaylandThread::_wp_tablet_tool_on_button(void *data, struct zwp_tablet_tool
 
 void WaylandThread::_wp_tablet_tool_on_frame(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t time) {
 	TabletToolState *ts = wp_tablet_tool_get_state(wp_tablet_tool_v2);
-
 	if (!ts) {
 		return;
 	}
 
 	SeatState *ss = wl_seat_get_seat_state(ts->wl_seat);
-
 	if (!ss) {
 		return;
 	}