Make focus part of transactions

Rather than maintain copies of the entire focus stack, this PR
transactionises the focus by introducing two new properties to the
container state and using those when rendering.

* `bool focused` means this container has actual focus. Only one
container should have this equalling true in its current state.
* `struct sway_container *focus_inactive_child` points to the immediate
child that was most recently focused (eg. for tabbed and stacked
containers).

1 files changed, 14 insertions, 4 deletions

diff --git a/sway/desktop/transaction.c b/sway/desktop/transaction.c
index 0ae042db..fcfb0b51 100644
--- a/sway/desktop/transaction.c
+++ b/sway/desktop/transaction.c
@@ -139,6 +139,14 @@ static void copy_pending_state(struct sway_container *container,
                 state->children = create_list();
                 list_cat(state->children, container->children);
         }
+
+        struct sway_seat *seat = input_manager_current_seat(input_manager);
+        state->focused = seat_get_focus(seat) == container;
+
+        if (container->type != C_VIEW) {
+                state->focused_inactive_child =
+                        seat_get_active_child(seat, container);
+        }
 }
 
 static void transaction_add_container(struct sway_transaction *transaction,
@@ -195,10 +203,12 @@ static void transaction_apply(struct sway_transaction *transaction) {
                         .width = instruction->state.swayc_width,
                         .height = instruction->state.swayc_height,
                 };
-                for (int j = 0; j < root_container.children->length; ++j) {
-                        struct sway_container *output = root_container.children->items[j];
-                        output_damage_box(output->sway_output, &old_box);
-                        output_damage_box(output->sway_output, &new_box);
+                for (int j = 0; j < root_container.current.children->length; ++j) {
+                        struct sway_container *output = root_container.current.children->items[j];
+                        if (output->sway_output) {
+                                output_damage_box(output->sway_output, &old_box);
+                                output_damage_box(output->sway_output, &new_box);
+                        }
                 }
 
                 // There are separate children lists for each instruction state, the