1 files changed, 11 insertions, 6 deletions
diff --git a/shaders/ui.frag.glsl b/shaders/ui.frag.glsl
index 62dbbfa2..cb38fff1 100644
--- a/shaders/ui.frag.glsl
+++ b/shaders/ui.frag.glsl
@@ -82,13 +82,18 @@ void main() {
     }
     vec4 cell = vec4(mix(under.rgb, v_fg, a), mix(under.a, 1.0, a));
 
-    // 3 = data dissolve. Changed cells retain the frozen old cell until their
-    // stable threshold, then atomically become the new cell. Exact endpoints
-    // mirror panel_animation.dissolveRevealed, including the zero hash.
+    // 3 = dissolve, a crossfade (G7): a changed cell's new form is drawn
+    // first, whole, and its frozen old one over it at 1 - progress,
+    // premultiplied (the frame's cells blend over, pipeline_over), so the
+    // old fades out as the new comes in; at the ends, exactly one of them.
+    // The tty keeps its per-cell swap (panel_animation.dissolveRevealed).
     if (effect == 3u) {
-        bool reveal = progress >= 1.0 || (progress > 0.0 && noise < progress);
-        if (oldLayer ? reveal : !reveal) discard;
-        o_col = cell;
+        if (!oldLayer) {
+            o_col = cell;
+            return;
+        }
+        if (progress >= 1.0) discard;
+        o_col = cell * (1.0 - progress);
         return;
     }