19e5eb84fda6b765410726d439ab366dce141e94
chmalee
  Wed Oct 29 16:07:50 2025 -0700
For the ddg2p cart rewrite, only turn on the new g2p container super track is the decipher supertrack was on previously

diff --git src/hg/cgilib/cartEdit9.c src/hg/cgilib/cartEdit9.c
index cb4dbe2d6a2..e5cf6160bb8 100644
--- src/hg/cgilib/cartEdit9.c
+++ src/hg/cgilib/cartEdit9.c
@@ -1,28 +1,31 @@
 /* The eigth edition of cartEdits. Please note that historically, cartEdit files
  * were named with 0-index names, like cartEdit0, cartEdit1, ... but the corresponding
  * trackDb entry referring to the cartEdit was 1-indexes, cartVersion 1, ...
  * Beginning with this cartEdit, we will now name cartEdits 1-indexed, so there
  * will be no cartEdit8, just like there was no October 5-14, 1582. */
 #include "common.h"
 #include "cart.h"
 
 static char *edit9TracksCcre[] = {
     "encodeCcreCombined",
 };
 
 static char *edit9TracksG2p[] = {
     "ddg2p",
 };
 
 void cartEdit9(struct cart *cart)
 {
 int length = 0;
 
 // turn the encodeCcreCombined track into a child of the new ccres supertrack
 length = ArraySize(edit9TracksCcre);
 cartTurnOnSuper(cart, edit9TracksCcre, length, "cCREs");
 
 // Move the ddg2p track from the decipher container to it's own supertrack
+// but only if the decipherContainer was on previously and ddg2p was also on
 length = ArraySize(edit9TracksG2p);
+char *oldContainerVis = cartOptionalString(cart, "decipherContainer");
+if (oldContainerVis && sameString(oldContainerVis, "show"))
     cartTurnOnSuper(cart, edit9TracksG2p, length, "g2pContainer");
 }