6da74d6034610d2ce3fe7ac708110c0e0e3d3a1c
kate
  Tue Mar 2 17:02:43 2021 -0800
Define string literal for multi-region chrom name. refs #26385

diff --git src/hg/hgTracks/hgTracks.c src/hg/hgTracks/hgTracks.c
index 035b380..8557e06 100644
--- src/hg/hgTracks/hgTracks.c
+++ src/hg/hgTracks/hgTracks.c
@@ -2687,31 +2687,31 @@
 *pChrom = cloneString(vPos);
 *pStart = atoi(colon+1) - 1;
 *pEnd = atoi(dash+1);
 }
 
 char *disguisePositionVirtSingleChrom(char *position) // DISGUISE VMODE
 /* Hide the virt position, convert to real single chrom span.
  * position should be virt chrom span.
  * Can handle anything in the virt single chrom. */
 {
 /* parse Virt position */
 char *chrom = NULL;
 long start = 0;
 long end = 0;
 parseVPosition(position, &chrom, &start, &end);
-if (!sameString(chrom, "multi"))
+if (!sameString(chrom, MULTI_REGION_VIRTUAL_CHROM_NAME))
     return position; // return original
 struct window *windows = makeWindowListFromVirtChrom(start, end);
 char *nonVirtChromName = windows->chromName;
 if (!sameString(nonVirtChromName, chromName))
     return position; // return original
 int nonVirtWinStart  = windows->winStart;
 int nonVirtWinEnd    = windows->winEnd;
 struct window *w;
 for (w=windows->next; w; w=w->next)
     {
     if (!sameString(w->chromName, nonVirtChromName))
 	return position; // return original
     if (w->winEnd < nonVirtWinEnd)
 	return position; // return original
     nonVirtWinEnd = w->winEnd;
@@ -3061,31 +3061,32 @@
 	nonVirtWinEnd = w->winEnd;
     }
 // TODO Also consider preserving the original bases in windows width (with clipping).
 char nvPos[256];
 safef(nvPos, sizeof nvPos, "%s:%d-%d", nonVirtChromName, nonVirtWinStart+1, nonVirtWinEnd);
 return cloneString(nvPos);
 }
 
 char *nonVirtPositionFromHighlightPos()
 /* Must have created the virtual chrom first.
  * Currently just a hack to use windows,
  * use the (first) window(s) from that to get real chrom name start end */
 {
 struct highlightVar *h = parseHighlightInfo();
 
-if (!(h && h->db && sameString(h->db, database) && sameString(h->chrom,"multi")))
+if (!(h && h->db && sameString(h->db, database) && 
+        sameString(h->chrom, MULTI_REGION_VIRTUAL_CHROM_NAME)))
     return NULL;
 
 struct window *windows = makeWindowListFromVirtChrom(h->chromStart, h->chromEnd);
 
 char *nonVirtChromName = windows->chromName;
 int nonVirtWinStart  = windows->winStart;
 int nonVirtWinEnd    = windows->winEnd;
 // Extending this through more of the windows,
 // if it is on the same chrom and maybe not too far separated.
 struct window *w;
 for (w=windows->next; w; w=w->next)
     {
     if (sameString(w->chromName, nonVirtChromName) && w->winEnd > nonVirtWinEnd)
 	nonVirtWinEnd = w->winEnd;
     }
@@ -9462,31 +9463,32 @@
 }
 
 void remapHighlightPos()
 // Remap non-virt highlight position if any to new virtMode chrom.
 {
 if (virtualSingleChrom())
     return;
 struct highlightVar *h = parseHighlightInfo();
 if (h && h->db && sameString(h->db, database))
     {
     long virtStart = 0, virtEnd = 0;
     if (findNearestVirtMatch(h->chrom, h->chromStart, h->chromEnd, FALSE, &virtStart, &virtEnd)) // try to find the nearest match
 	{
 	// save new highlight position to cart var
 	char cartVar[1024];
-	safef(cartVar, sizeof cartVar, "%s.%s:%ld-%ld#%s", h->db, "multi", virtStart, virtEnd, h->hexColor);
+	safef(cartVar, sizeof cartVar, "%s.%s:%ld-%ld#%s", h->db, MULTI_REGION_VIRTUAL_CHROM_NAME, 
+                virtStart, virtEnd, h->hexColor);
 	cartSetString(cart, "highlight", cartVar);
 	}
     else
 	{
 	// erase the highlight cartvar if it has no overlap with the new virt chrom
 	cartRemove(cart, "highlight");
 	}
     }
 }
 
 
 void tracksDisplay()
 /* Put up main tracks display. This routine handles zooming and
  * scrolling. */
 {