4ae8ea2a6a2bf765c62f1f12c35297e451419188
braney
  Tue Mar 24 11:53:43 2026 -0700
exclude bigRmsk from canWiggle() to prevent crash when forceWiggle triggers, fixes #37229

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

diff --git src/hg/hgTracks/simpleTracks.c src/hg/hgTracks/simpleTracks.c
index 9cc78375ec5..3bb3fa27f9e 100644
--- src/hg/hgTracks/simpleTracks.c
+++ src/hg/hgTracks/simpleTracks.c
@@ -11655,31 +11655,32 @@
 {
 struct track *subtrack;
 int ct = 0;
 for (subtrack = trackList; subtrack; subtrack = subtrack->next)
     if (isSubtrackVisible(subtrack))
         ct++;
 return ct;
 }
 
 static boolean canWiggle(struct track *tg)
 /* Is this a track type that can wiggle. */
 {
 return (tg->isBigBed &&
             !startsWith("bigInteract",tg->tdb->type) &&
             !startsWith("bigMaf",tg->tdb->type) &&
-            !startsWith("bigLolly",tg->tdb->type))
+            !startsWith("bigLolly",tg->tdb->type) &&
+            !startsWith("bigRmsk",tg->tdb->type))
         || startsWith("vcfTabix", tg->tdb->type)
         || startsWith("bam", tg->tdb->type);
 }
 
 enum trackVisibility limitVisibility(struct track *tg)
 /* Return default visibility limited by number of items and
  * by parent visibility if part of a coposite track.
  * This also sets tg->height. */
 {
 if (forceWiggle && canWiggle(tg))
     {
     tg->limitWiggle = TRUE;
     }
 
 if (!tg->limitedVisSet)