Feed: a picture with no column-sized copy is decoded ahead too, so its row paints it on the first frame

Since column-sized copies (8249fbe), a picture small enough to keep (or a GIF)
was fetched for its size but never decoded ahead: the row's <img> decoded it
on sight, from the network again when the host says no-store. Decode the
original ahead when there is no copy. (feed-live-test caught it.)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/features/messages.js b/src/features/messages.js
index f98df3a..bad4a60 100644
--- a/src/features/messages.js
+++ b/src/features/messages.js
@@ -5654,7 +5654,9 @@ export function messagesFeature(ctx) {
       const task = (async () => {
         const got = (await storedMediaThumb(url)) || (await makeMediaThumb(url).catch(() => null));
         if (got) {
-          if (got.thumb) await decodeAhead(got.thumb);
+          // no copy (small already, or a GIF): the original is what paints,
+          // so it's the one decoded ahead — the row mustn't decode it on sight
+          await decodeAhead(got.thumb || url);
           mediaReady.set(url, got);
           return;
         }