Report held pointer buttons on every pointer event

Pointer events set button only on press and release, so wsap_term tracked
held buttons itself to tell a drag from a hover.

yasl_pointer_event.buttons now holds a YASL_BUTTON_BIT() mask of the buttons
held after each event. The common input queue tracks it from the DOWN and
UP events it queues, and clears it on INPUT_RESET and on allocation
failure. Wayland also clears it on leave, since the compositor sends leave
during a press only when it takes the pointer and no release follows. X11
and Cocoa keep it, because they deliver motion and the release to the
pressed window after leave.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/common/test_input_alloc.c b/tests/common/test_input_alloc.c
index b999a62..7aba4b2 100644
--- a/tests/common/test_input_alloc.c
+++ b/tests/common/test_input_alloc.c
@@ -46,6 +46,16 @@ int main(void)
         assert(input_queue_pop(&q, &out) && out.type == YASL_EVENT_INPUT_RESET);
         assert(input_queue_pop(&q, &out) && out.key.action == YASL_KEY_RELEASE);
         input_queue_clear(&q);
+
+        /* A lost event clears held buttons along with the stream. */
+        in = (struct yasl_event){.surface = surface, .type = YASL_EVENT_POINTER_DOWN};
+        assert(input_queue_push(&q, &in) && q.buttons);
+        for (size_t i = 1; i < q.capacity; i++) assert(input_queue_push(&q, &in));
+        allocations = 0;
+        assert(!input_queue_push(&q, &in));
+        allocations = -1;
+        assert(!q.buttons);
+        input_queue_clear(&q);
     }
     return 0;
 }