Fix reload freeze when not modsetting current mode

This fixes the issue of the display freezing on reload with
wlroots#1545.

On master, all output configs are applied on reload. This may cause an
output to have its config applied up to three times, instead of just
once. The three cases are: output name, output identifier, and wildcard.
Not only is this inefficient, but it can cause swaybg to be spawned and
immediately killed.

However, swaybg requires two roundtrips of wl_display (to obtain needed
globals) before it enters its normal event loop. Modesetting will
roundtrip the wl_display. Without modesetting, waitpid for killing
swaybg could block infinitely due to swaybg being blocked by
wl_display_roundtrip.

This only configured an output once. It either uses the wildcard config
or creates an empty wildcard config and applies that. This also fixes a
bug where an output would not be reset when there is no output config to
apply to it.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/sway/config.h b/include/sway/config.h
index 43ea7778..54cdcc90 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -586,6 +586,8 @@ struct output_config *store_output_config(struct output_config *oc);
 
 void apply_output_config_to_outputs(struct output_config *oc);
 
+void reset_outputs(void);
+
 void free_output_config(struct output_config *oc);
 
 int workspace_output_cmp_workspace(const void *a, const void *b);