a8f93bb9c0961e8e3ac25a0168ad2d2eb6b66fad
kent
  Wed Apr 25 23:30:45 2012 -0700
Fixing missing c=chromName in a lot of links.  A bug Tim put in 2009 from what I can tell that manifests with an empty cart on IE.
diff --git src/hg/hgTracks/chromGraphTrack.c src/hg/hgTracks/chromGraphTrack.c
index 8be34e8..46faab3 100644
--- src/hg/hgTracks/chromGraphTrack.c
+++ src/hg/hgTracks/chromGraphTrack.c
@@ -171,32 +171,32 @@
 	lastPos = pos;
 	if (pos >= seqEnd)
 	    break;
 	}
     sqlFreeResult(&sr);
     hFreeConn(&conn);
     }
 
 /* Do map box */
 xOff = hvGfxAdjXW(hvg, xOff, width);
 
 char *encodedTrack = cgiEncode(tg->track);
 if(theImgBox && curImgTrack)
     {
     char link[512];     // FIXME: winStart/winEnd are not right when using a portal
-    safef(link,sizeof(link),"%s&o=%d&t=%d&g=%s", hgcNameAndSettings(),
-        winStart, winEnd, encodedTrack);
+    safef(link,sizeof(link),"%s&c=%s&o=%d&t=%d&g=%s", hgcNameAndSettings(),
+        chromName, winStart, winEnd, encodedTrack);
     #ifdef IMAGEv2_SHORT_MAPITEMS
         if(xOff < insideX && xOff+width > insideX)
             warn("cgDrawEither(%s) map item spanning slices. LX:%d TY:%d RX:%d BY:%d  link:[%s]",encodedTrack,xOff, yOff, xOff+width, yOff+height, link);
     #endif//def IMAGEv2_SHORT_MAPITEMS
     imgTrackAddMapItem(curImgTrack,link,NULL,xOff,yOff,xOff+width,yOff+height,tg->track);
     }
 else
     {
     hPrintf("<AREA SHAPE=RECT COORDS=\"%d,%d,%d,%d\" ", xOff, yOff, xOff+width,
         yOff+height);
     hPrintf("HREF=\"%s&o=%d&t=%d&g=%s&c=%s&l=%d&r=%d&db=%s&pix=%d\">\n",
             hgcNameAndSettings(), winStart, winEnd, encodedTrack, chromName, winStart, winEnd,
             database, tl.picWidth);
     }
 }