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, 1 insertions, 0 deletions

diff --git a/include/sway/tree/root.h b/include/sway/tree/root.h
index d1f04a96..ee4bd836 100644
--- a/include/sway/tree/root.h
+++ b/include/sway/tree/root.h
@@ -24,6 +24,7 @@ struct sway_root {
         struct wl_list outputs; // sway_output::link
 
         list_t *scratchpad; // struct sway_container
+        list_t *saved_workspaces; // For when there's no connected outputs
 
         struct {
                 struct wl_signal new_container;