Refactor arrange_windows()

Replaces arrange_windows() with arrange_root(), arrange_output(),
arrange_workspace() and arrange_children_of().

Also makes fullscreen views save and restore their dimensions, which
allows it to preserve any custom resize and is also a requirement for
floating views once they are implemented.

include/sway/tree/arrange.h

@@ -0,0 +1,20 @@
+#ifndef _SWAY_ARRANGE_H
+#define _SWAY_ARRANGE_H
+
+struct sway_container;
+
+void arrange_windows(struct sway_container *container);
+
+// Determine the root container's geometry, then iterate to everything below
+void arrange_root(void);
+
+// Determine the output's geometry, then iterate to everything below
+void arrange_output(struct sway_container *output);
+
+// Determine the workspace's geometry, then iterate to everything below
+void arrange_workspace(struct sway_container *workspace);
+
+// Arrange layout for all the children of the given workspace/container
+void arrange_children_of(struct sway_container *parent);
+
+#endif

include/sway/tree/container.h

@@ -75,6 +75,7 @@ struct sway_container {
 	double x, y;
 	// does not include borders or gaps.
 	double width, height;
+	double saved_width, saved_height;
 
 	list_t *children;
 

include/sway/tree/layout.h

@@ -60,9 +60,6 @@ enum sway_container_layout container_get_default_layout(
 
 void container_sort_workspaces(struct sway_container *output);
 
-void arrange_windows(struct sway_container *container,
-		double width, double height);
-
 struct sway_container *container_get_in_direction(struct sway_container
 		*container, struct sway_seat *seat, enum movement_direction dir);
 

include/sway/tree/view.h

@@ -162,6 +162,8 @@ void view_configure(struct sway_view *view, double ox, double oy, int width,
 
 void view_set_activated(struct sway_view *view, bool activated);
 
+void view_set_fullscreen_raw(struct sway_view *view, bool fullscreen);
+
 void view_set_fullscreen(struct sway_view *view, bool fullscreen);
 
 void view_close(struct sway_view *view);