File fix-output-off-crash.patch of Package wlroots

From 7392b3313a7b483c61f4fea648ba8f2aa4ce8798 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 12 Aug 2025 19:00:11 +0200
Subject: [PATCH] backend, output: send commit events after applying all in
 wlr_backend_commit()

We were iterating over involved outputs, applying the new state and
sending the commit event for each one. This resulted in commit
events being fired while we weren't done applying the new state for
all outputs.

Fix this by first applying all of the states, then firing all of
the events.

Closes: https://github.com/swaywm/sway/issues/8829
---
 backend/backend.c          | 5 +++++
 include/types/wlr_output.h | 1 +
 types/output/output.c      | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/backend/backend.c b/backend/backend.c
index a130d9045a..3d84aa636f 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -485,5 +485,10 @@ bool wlr_backend_commit(struct wlr_backend *backend,
 		output_apply_commit(state->output, &state->base);
 	}
 
+	for (size_t i = 0; i < states_len; i++) {
+		const struct wlr_backend_output_state *state = &states[i];
+		output_send_commit_event(state->output, &state->base);
+	}
+
 	return true;
 }
diff --git a/include/types/wlr_output.h b/include/types/wlr_output.h
index f901505afc..d59b05f0b9 100644
--- a/include/types/wlr_output.h
+++ b/include/types/wlr_output.h
@@ -27,6 +27,7 @@ void output_defer_present(struct wlr_output *output, struct wlr_output_event_pre
 
 bool output_prepare_commit(struct wlr_output *output, const struct wlr_output_state *state);
 void output_apply_commit(struct wlr_output *output, const struct wlr_output_state *state);
+void output_send_commit_event(struct wlr_output *output, const struct wlr_output_state *state);
 
 void output_state_get_buffer_src_box(const struct wlr_output_state *state,
 	struct wlr_fbox *out);
diff --git a/types/output/output.c b/types/output/output.c
index 636d155d21..1fb0347a0b 100644
--- a/types/output/output.c
+++ b/types/output/output.c
@@ -759,7 +759,9 @@ void output_apply_commit(struct wlr_output *output, const struct wlr_output_stat
 	}
 
 	output_apply_state(output, state);
+}
 
+void output_send_commit_event(struct wlr_output *output, const struct wlr_output_state *state) {
 	struct timespec now;
 	clock_gettime(CLOCK_MONOTONIC, &now);
 	struct wlr_output_event_commit event = {
@@ -801,6 +803,7 @@ bool wlr_output_commit_state(struct wlr_output *output,
 	}
 
 	output_apply_commit(output, &pending);
+	output_send_commit_event(output, &pending);
 
 	if (new_back_buffer) {
 		wlr_buffer_unlock(pending.buffer);
-- 
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