Refactor destroy functions and save workspaces when there's no outputs

This changes the destroy functions to the following:

* output_begin_destroy
* output_destroy
* workspace_begin_destroy
* workspace_destroy
* container_begin_destroy
* container_destroy
* view_begin_destroy
* view_destroy

The terminology was `destroy` and `free`, and it has been changed to
`begin_destroy` and `destroy` respectively.

When the last output is disconnected, its workspaces will now be stashed
in the root. Upon connection of a new output they will be restored.

There is a new function `workspace_consider_destroy` which decides
whether the given workspace should be destroyed or not (ie. empty and
not visible).

Calling container_begin_destroy will no longer automatically reap the
parents. In some places we want to reap the parents and in some we
don't, so this is left to the caller.

container_reap_empty_recursive and container_reap_empty have been
combined into one function and it will recurse up the tree.

1 files changed, 2 insertions, 2 deletions

diff --git a/sway/tree/layout.c b/sway/tree/layout.c
index a3de44ce..12e7342b 100644
--- a/sway/tree/layout.c
+++ b/sway/tree/layout.c
@@ -302,7 +302,7 @@ static void workspace_rejigger(struct sway_container *ws,
                 move_dir == MOVE_LEFT || move_dir == MOVE_RIGHT ? L_HORIZ : L_VERT;
 
         container_flatten(ws);
-        container_reap_empty_recursive(original_parent);
+        container_reap_empty(original_parent);
         container_create_notify(new_parent);
 }
 
@@ -325,7 +325,7 @@ static void move_out_of_tabs_stacks(struct sway_container *container,
                 container_insert_child(new_parent->parent, container, offs < 0 ? 0 : 1);
         } else {
                 container_insert_child(new_parent, container, offs < 0 ? 0 : 1);
-                container_reap_empty_recursive(new_parent->parent);
+                container_reap_empty(new_parent->parent);
                 container_flatten(new_parent->parent);
         }
         container_create_notify(new_parent);