transactions: Amend pending transactions

The transaction system contains a necessary optimization where a popped
transaction is combined with later, similar transactions. This breaks
the chronological order of states, and can lead to desynchronized
geometries.

To fix this, we replace the queue with only 2 transactions: current and
pending. If a pending transaction exists, it is updated with new state
instead of creating additional transactions.

As we never have more than a single waiting transaction, we no longer
need the queue optimization that is causing problems.

Closes: https://github.com/swaywm/sway/issues/6012

1 files changed, 0 insertions, 2 deletions

diff --git a/sway/server.c b/sway/server.c
index f180da9a..278afd19 100644
--- a/sway/server.c
+++ b/sway/server.c
@@ -199,7 +199,6 @@ bool server_init(struct sway_server *server) {
         }
 
         server->dirty_nodes = create_list();
-        server->transactions = create_list();
 
         server->input = input_manager_create(server);
         input_manager_get_default_seat(); // create seat0
@@ -215,7 +214,6 @@ void server_fini(struct sway_server *server) {
         wl_display_destroy_clients(server->wl_display);
         wl_display_destroy(server->wl_display);
         list_free(server->dirty_nodes);
-        list_free(server->transactions);
 }
 
 bool server_start(struct sway_server *server) {