Deprecate seat idle_wake

Sway has two knobs to control idling:

- seat idle_inhibit: when the seat is active (ie. not idle), this
  extends the active state. When the seat is idle, this is
  ignored.
- seat idle_wake: when the seat is idle, this wakes up the seat.
  When the seat is active, this is ignored.

The motivation for the deprecation is two-fold:

- The concept of "seat idle state" is ill-defined. Each idle-notify-v1
  client will pass a different idle timeout. With the old logic, a
  seat was declared idle if and only if all idle-notify-v1 timeouts have
  expired. However, if only a portion of the timeouts have expired,
  then some clients would wake up, and the rest would stay active.
  This is inconsistent with the definition of idle_inhibit/idle_wake:
  idle_inhibit was used for clients which are waking up.
- It never worked properly with the new idle-notify-v1 protocol
  and no-one noticed. Only the legacy KDE idle protocol is taken
  into account, but that protocol is not used anymore.

1 files changed, 6 insertions, 0 deletions

diff --git a/sway/commands/seat/idle.c b/sway/commands/seat/idle.c
index 82428f2c..62b94db2 100644
--- a/sway/commands/seat/idle.c
+++ b/sway/commands/seat/idle.c
@@ -3,6 +3,7 @@
 #include <string.h>
 #include <strings.h>
 #include <stdint.h>
+#include "log.h"
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "sway/input/seat.h"
@@ -69,5 +70,10 @@ struct cmd_results *seat_cmd_idle_wake(int argc, char **argv) {
 		return cmd_results_new(CMD_FAILURE, "Invalid idle source");
 	}
 	config->handler_context.seat_config->idle_wake_sources = sources;
+	sway_log(SWAY_INFO, "Warning: seat idle_wake is deprecated");
+	if (config->reading) {
+		config_add_swaynag_warning("seat idle_wake is deprecated. "
+			"Only seat idle_inhibit is supported.");
+	}
 	return cmd_results_new(CMD_SUCCESS, NULL);
 }