b94993d07e5d0ef24f17a40c9ca7f5b2ddb93701
braney
  Wed May 11 10:50:56 2022 -0700
allow hubs to specify a naming authority for the chromosome that's
displayed by the browser

diff --git src/hg/hgTracks/hgTracks.h src/hg/hgTracks/hgTracks.h
index bf740e6..e4f5dec 100644
--- src/hg/hgTracks/hgTracks.h
+++ src/hg/hgTracks/hgTracks.h
@@ -527,30 +527,31 @@
 extern struct trackLayout tl;
 extern struct jsonElement *jsonForClient;
 
 /* multiple windows */
 extern struct window *windows;        // list of windows in image
 extern struct window *currentWindow;  // current window
 extern bool trackLoadingInProgress;  // flag to delay ss layout until all windows are ready.
 extern int fullInsideX;      // full-image insideX 
 extern int fullInsideWidth;  // full-image insideWidth 
 
 extern struct cart *cart; /* The cart where we keep persistent variables. */
 extern struct hash *oldVars;       /* List of vars from previous cart. */
 extern struct track *trackList;    /* List of all tracks. */
 extern struct hash *trackHash; /* Hash of the tracks by their name. */
 extern char *chromName;	  /* Name of chromosome sequence . */
+extern char *displayChromName;	  /* Name of chromosome sequence to display . */
 extern char *database;	  /* Name of database we're using. */
 extern char *organism;	  /* Name of organism we're working on. */
 extern char *browserName;              /* Test or public browser */
 extern char *organization;             /* UCSC or MGC */
 extern int winStart;	  /* Start of window in sequence. */
 extern int winEnd;	  /* End of window in sequence. */
 extern int maxItemsInFullTrack;  /* Maximum number of items displayed in full */
 extern char *position; 		/* Name of position. */
 extern int gfxBorder;		/* Width of graphics border. */
 extern int insideWidth;		/* Width of area to draw tracks in in pixels. */
 extern int insideX;		/* Start of area to draw track in in pixels. */
 extern int leftLabelX;		/* Start of area to draw left labels on. */
 extern int leftLabelWidth;	/* Width of area to draw left labels on. */
 extern boolean withLeftLabels;		/* Display left labels? */
 extern boolean withCenterLabels;	/* Display center labels? */