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, 9 insertions, 0 deletions

diff --git a/include/sway/tree/workspace.h b/include/sway/tree/workspace.h
index 35c91017..efcb7c69 100644
--- a/include/sway/tree/workspace.h
+++ b/include/sway/tree/workspace.h
@@ -18,6 +18,15 @@ extern char *prev_workspace_name;
 
 struct sway_container *workspace_get_initial_output(const char *name);
 
+struct sway_container *workspace_create(struct sway_container *output,
+                const char *name);
+
+void workspace_destroy(struct sway_container *workspace);
+
+void workspace_begin_destroy(struct sway_container *workspace);
+
+void workspace_consider_destroy(struct sway_container *ws);
+
 char *workspace_next_name(const char *output_name);
 
 bool workspace_switch(struct sway_container *workspace,