tty: Bump sequence on successful queue_frame()

Before this commit:

- niri queues frame
- successful VBlank happens, sequence is bumped, frame callbacks are
  sent
- niri receives commit, redraws, queues next frame, tries to send frame
  callbacks, but there wasn't a new VBlank yet, so the sequence is old,
  and frame callbacks aren't sent
- frame callbacks are sent only next VBlank

1 files changed, 7 insertions, 0 deletions

diff --git a/src/backend/tty.rs b/src/backend/tty.rs
index 117cb0da..63e81322 100644
--- a/src/backend/tty.rs
+++ b/src/backend/tty.rs
@@ -1147,6 +1147,13 @@ impl Tty {
                                 }
                             };
 
+                            // We queued this frame successfully, so now we'll be sending frame
+                            // callbacks for the next sequence.
+                            if let Some(sequence) = output_state.current_estimated_sequence.as_mut()
+                            {
+                                *sequence = sequence.wrapping_add(1);
+                            }
+
                             return RenderResult::Submitted;
                         }
                         Err(err) => {