Fix edge cases when moving floating container to new workspace

* Removes container_floating_move_to_container, instead opting to put
that logic in container_move_to
* In the seat code, focusing a floating view now updates the pending
state only and lets the next transaction carry it over to the current
state. This is required, otherwise it would crash.
* When unfullscreening a floating container, an output check is now done
to see if it should center it.

include/sway/tree/container.h

@@ -322,6 +322,12 @@ void container_get_box(struct sway_container *container, struct wlr_box *box);
 void container_floating_translate(struct sway_container *con,
 		double x_amount, double y_amount);
 
+/**
+ * Choose an output for the floating container's new position.
+ */
+struct sway_container *container_floating_find_output(
+		struct sway_container *con);
+
 /**
  * Move a floating container to a new layout-local position.
  */
@@ -333,9 +339,6 @@ void container_floating_move_to(struct sway_container *con,
  */
 void container_floating_move_to_center(struct sway_container *con);
 
-void container_floating_move_to_container(struct sway_container *container,
-		struct sway_container *destination);
-
 /**
  * Mark a container as dirty if it isn't already. Dirty containers will be
  * included in the next transaction then unmarked as dirty.

sway/input/seat.c

@@ -717,12 +717,8 @@ void seat_set_focus_warp(struct sway_seat *seat,
 
 	// If we've focused a floating container, bring it to the front.
 	// We do this by putting it at the end of the floating list.
-	// This must happen for both the pending and current children lists.
 	if (container && container_is_floating(container)) {
 		list_move_to_end(container->parent->children, container);
-		if (container_has_ancestor(container, container->current.parent)) {
-			list_move_to_end(container->parent->current.children, container);
-		}
 	}
 
 	// clean up unfocused empty workspace on new output

sway/tree/container.c

@@ -1182,7 +1182,7 @@ void container_floating_translate(struct sway_container *con,
  * one, otherwise we'll choose whichever output is closest to the container's
  * center.
  */
-static struct sway_container *container_floating_find_output(
+struct sway_container *container_floating_find_output(
 		struct sway_container *con) {
 	double center_x = con->x + con->width / 2;
 	double center_y = con->y + con->height / 2;
@@ -1245,39 +1245,6 @@ void container_floating_move_to_center(struct sway_container *con) {
 	container_floating_translate(con, new_lx - con->x, new_ly - con->y);
 }
 
-void container_floating_move_to_container(struct sway_container *container,
-		struct sway_container *destination) {
-	// Resolve destination into a workspace
-	struct sway_container *new_ws = NULL;
-	if (destination->type == C_OUTPUT) {
-		new_ws = output_get_active_workspace(destination->sway_output);
-	} else if (destination->type == C_WORKSPACE) {
-		new_ws = destination;
-	} else {
-		new_ws = container_parent(destination, C_WORKSPACE);
-	}
-	if (!new_ws) {
-		// This can happen if the user has run "move container to mark foo",
-		// where mark foo is on a hidden scratchpad container.
-		return;
-	}
-	struct sway_container *old_ws = container_parent(container, C_WORKSPACE);
-	if (old_ws != new_ws) {
-		container_remove_child(container);
-		container_add_child(new_ws->sway_workspace->floating, container);
-		arrange_windows(old_ws);
-		arrange_windows(new_ws);
-		workspace_detect_urgent(old_ws);
-		workspace_detect_urgent(new_ws);
-	}
-	// If the container's center doesn't overlap the new workspace, center it
-	// within the workspace.
-	struct sway_container *output = container_floating_find_output(container);
-	if (new_ws->parent != output) {
-		container_floating_move_to_center(container);
-	}
-}
-
 void container_set_dirty(struct sway_container *container) {
 	if (container->dirty) {
 		return;
@@ -1357,6 +1324,11 @@ void container_set_fullscreen(struct sway_container *container, bool enable) {
 			container->y = container->saved_y;
 			container->width = container->saved_width;
 			container->height = container->saved_height;
+			struct sway_container *output =
+				container_floating_find_output(container);
+			if (!container_has_ancestor(container, output)) {
+				container_floating_move_to_center(container);
+			}
 		} else {
 			container->width = container->saved_width;
 			container->height = container->saved_height;

sway/tree/layout.c

@@ -150,22 +150,44 @@ void container_move_to(struct sway_container *container,
 			|| container_has_ancestor(container, destination)) {
 		return;
 	}
+	struct sway_container *old_parent = NULL;
+	struct sway_container *new_parent = NULL;
 	if (container_is_floating(container)) {
-		container_floating_move_to_container(container, destination);
+		// Resolve destination into a workspace
+		struct sway_container *new_ws = NULL;
+		if (destination->type == C_OUTPUT) {
+			new_ws = output_get_active_workspace(destination->sway_output);
+		} else if (destination->type == C_WORKSPACE) {
+			new_ws = destination;
+		} else {
+			new_ws = container_parent(destination, C_WORKSPACE);
+		}
+		if (!new_ws) {
+			// This can happen if the user has run "move container to mark foo",
+			// where mark foo is on a hidden scratchpad container.
 			return;
 		}
-	struct sway_container *old_parent = container_remove_child(container);
+		struct sway_container *old_output =
+			container_parent(container, C_OUTPUT);
+		old_parent = container_remove_child(container);
+		container_add_child(new_ws->sway_workspace->floating, container);
+		// If changing output, center it within the workspace
+		if (old_output != new_ws->parent && !container->is_fullscreen) {
+			container_floating_move_to_center(container);
+		}
+	} else {
+		old_parent = container_remove_child(container);
 		container->width = container->height = 0;
 		container->saved_width = container->saved_height = 0;
 
-	struct sway_container *new_parent;
-
 		if (destination->type == C_VIEW) {
 			new_parent = container_add_sibling(destination, container);
 		} else {
 			new_parent = destination;
 			container_add_child(destination, container);
 		}
+	}
+
 	wl_signal_emit(&container->events.reparent, old_parent);
 
 	if (container->type == C_VIEW) {