Update turtle-singer.js

Author: 7se7en72025

js/turtle-singer.js

@@ -2480,21 +2480,31 @@ class Singer {
                 tur.singer.embeddedGraphics[blk] = [];
 
                 // Ensure note value block unhighlights after note plays.
-                // Cancel any previously pending unhighlight timer for this block to
-                // prevent unbounded timer accumulation in tight infinite loops, which
-                // would otherwise saturate the JS timer queue and stall the main thread.
+                // -- Merged fix: our timer-dedup + master's min-duration floor & stage.update --
+                // 1. Cancel any previously pending unhighlight timer for this block to
+                //    prevent unbounded timer accumulation in tight infinite loops, which
+                //    would otherwise saturate the JS timer queue and stall the main thread.
+                // 2. Enforce a minimum visible highlight duration (80 ms) so fast notes
+                //    still produce a visible glow rather than instantly clearing.
+                // 3. Call activity.stage.update() after unhighlight so the canvas
+                //    repaints immediately (matches master's behaviour).
+                const MIN_HIGHLIGHT_DURATION_MS = 80;
                 if (!tur.singer._unhighlightTimers) {
                     tur.singer._unhighlightTimers = {};
                 }
                 if (tur.singer._unhighlightTimers[blk]) {
                     clearTimeout(tur.singer._unhighlightTimers[blk]);
                 }
+                const highlightDurationMs = Math.max(beatValue * 1000, MIN_HIGHLIGHT_DURATION_MS);
                 tur.singer._unhighlightTimers[blk] = setTimeout(() => {
                     if (activity.blocks.visible && blk in activity.blocks.blockList) {
                         activity.blocks.unhighlight(blk);
+                        if (activity.stage) {
+                            activity.stage.update();
+                        }
                     }
                     delete tur.singer._unhighlightTimers[blk];
-                }, beatValue * 1000);
+                }, highlightDurationMs);
             };
 
             if (last(tur.singer.inNoteBlock) !== null || noteInNote) {