From 01220df57928a6148d4779eeea9b2fbbdb737c54 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <brandon@storyteller.ai>
Date: Mon, 2 Nov 2026 04:51:01 -0500
Subject: [PATCH] design.background: check the index before a picture is added
 to the media

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/design/slide_background.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/design/slide_background.rs b/crates/engine/src/cmd/design/slide_background.rs
index 92f3ce77..494b53be 100644
--- a/crates/engine/src/cmd/design/slide_background.rs
+++ b/crates/engine/src/cmd/design/slide_background.rs
@@ -7,6 +7,8 @@ pub(super) fn background(s: &mut Session, p: &Value) -> Result<Value> {
     if bool_or(p, "copy", false) {
         return copy_slide_background(s);
     }
+    // Check the index before anything is edited: a picture is added to the media first.
+    let index = opt_usize_param(p, "index", "design.background")?;
     let props = p.get("pictureProps").filter(|v| v.is_object()).cloned();
     let transparency = f64_param(p, "transparency");
     let reset = bool_or(p, "reset", false);
@@ -62,7 +64,6 @@ pub(super) fn background(s: &mut Session, p: &Value) -> Result<Value> {
         ));
     };
     let all = bool_or(p, "all", false);
-    let index = opt_usize_param(p, "index", "design.background")?;
     if matches!(op, BgOp::Adjust) {
         let next = {
             let st = s.doc()?;