1fcd74f4187843438947883d02d248108f918840
max
  Tue Apr 30 13:55:32 2019 -0700
Revert "first try to fix too-small highlight bug, refs #23349"

This reverts commit 93f9a02e8a70606f70c425971bb1d961eec3d080.

diff --git src/hg/js/hgTracks.js src/hg/js/hgTracks.js
index 150ada9..99173a0 100644
--- src/hg/js/hgTracks.js
+++ src/hg/js/hgTracks.js
@@ -378,65 +378,60 @@
                                             imgOfs.left + hgTracks.insideX - slop;
         var rightX = hgTracks.revCmplDisp ? imgOfs.left + imgWidth - hgTracks.insideX + slop :
                                             imgOfs.left + imgWidth + slop;
 
         return (   (selection.event.pageX >= leftX)
                 && (selection.event.pageX < rightX)
                 && (selection.event.pageY >= (imgOfs.top - slop))
                 && (selection.event.pageY <  (imgOfs.top + imgHeight + slop)));
     },
 
     pixelsToBases: function (img, selStart, selEnd, winStart, winEnd)
     {   // Convert image coordinates to chromosome coordinates
         var imgWidth = jQuery(img).width() - hgTracks.insideX;
         var width = hgTracks.winEnd - hgTracks.winStart;
         var mult = width / imgWidth;   // mult is bp/pixel multiplier
-        var halfBpWidth = (imgWidth / width) / 2; // how many pixels does one 1/2 bp take up;
+        var halfBpWidth = (imgWidth / width) / 2; // how many pixels does one bp take up;
         var startDelta;   // startDelta is how many bp's to the right/left
         var x1;
 
         // The magic number three appear at another place in the code 
         // as LEFTADD. It was originally annotated as "borders or cgi item calc
         // ?" by Larry. It has to be used when going any time when converting 
         // between pixels and coordinates.
         selStart -= 3;
         selEnd -= 3;
 
         if (hgTracks.revCmplDisp) {
             x1 = Math.min(imgWidth, selStart);
             startDelta = Math.floor(mult * (imgWidth - x1 - halfBpWidth));
         } else {
             x1 = Math.max(hgTracks.insideX, selStart);
             startDelta = Math.floor(mult * (x1 - hgTracks.insideX + halfBpWidth));
         }
         var endDelta;
         var x2;
         if (hgTracks.revCmplDisp) {
             endDelta = startDelta;
             x2 = Math.min(imgWidth, selEnd);
             startDelta = Math.floor(mult * (imgWidth - x2 + halfBpWidth));
         } else {
             x2 = Math.max(hgTracks.insideX, selEnd);
             endDelta = Math.floor(mult * (x2 - hgTracks.insideX - halfBpWidth));
         }
         var newStart = hgTracks.winStart + startDelta;
         var newEnd = hgTracks.winStart + 1 + endDelta;
-        
-        // if highlight is between two bases, at high zoom level, start can be > end
-        if (newStart>=newEnd > 0)
-            newStart -= 1;
-
         if (newEnd > winEnd) {
             newEnd = winEnd;
         }
         return {chromStart : newStart, chromEnd : newEnd};
     },
 
     chromToVirtChrom: function (chrom, chromStart, chromEnd)
     {   // Convert regular chromosome position to virtual chrom coordinates using hgTracks.windows list
         // Consider the first contiguous set of overlapping regions to define the match (for now).
         // only works for regions covered by the current hgTracks.windows
         var virtStart = -1, virtEnd = -1;
         var s,e;
         var i, len;
         for (i = 0, len = hgTracks.windows.length; i < len; ++i) {
             var w = hgTracks.windows[i];