5fa73cd9b411b3147227a4a31f6df7b24638dd00
max
  Fri Apr 24 05:37:11 2026 -0700
adding exon length to mouseover, refs #37439

diff --git src/hg/hgTracks/simpleTracks.c src/hg/hgTracks/simpleTracks.c
index 15821d3d835..dd983c5b5d1 100644
--- src/hg/hgTracks/simpleTracks.c
+++ src/hg/hgTracks/simpleTracks.c
@@ -3073,57 +3073,57 @@
                                 int w = codonex - codonsx;
                                 if (w > 0)
                                     {
                                     // temporarily remove the mouseOver from the lf, since linkedFeatureMapItem will always 
                                     // prefer a lf->mouseOver over the itemName
                                     char *oldMouseOver = lf->mouseOver;
                                     lf->mouseOver = NULL;
                                     dyStringClear(codonDy);
                                     // if you change this text, make sure you also change hgTracks.js:mouseOverToLabel
                                     if (!isEmpty(existingText))
                                         dyStringPrintf(codonDy, "<b>Transcript: </b> %s<br>", existingText);
                                     int codonHgvsIx = (codon->codonIndex - 1) * 3;
                                     if (codonHgvsIx >= 0)
                                         dyStringPrintf(codonDy, "<b>Codons: </b> c.%d-%d<br>", codonHgvsIx + 1, codonHgvsIx + 3);
                                     // if you change the text below, also change hgTracks:mouseOverToExon
-                                    dyStringPrintf(codonDy, "<b>Strand: </b> %c<br><b>Exon: </b>%s %d of %d<br>%s",
-                                                strandChar, exonIntronText, exonIntronNumber, numExonIntrons, phaseText);
+                                    dyStringPrintf(codonDy, "<b>Strand: </b> %c&nbsp;&nbsp;&nbsp;&nbsp;<b>Length: </b>%dbp<br><b>Exon: </b>%s %d of %d<br>%s",
+                                                strandChar, e - s, exonIntronText, exonIntronNumber, numExonIntrons, phaseText);
                                     tg->mapItem(tg, hvg, item, codonDy->string, tg->mapItemName(tg, item),
                                             sItem, eItem, codonsx, y, w, heightPer);
                                     // and restore the mouseOver
                                     lf->mouseOver = oldMouseOver;
                                     }
                                 }
                             }
                         }
                     }
                 else // either an intron, or else an exon zoomed out too far for codons (or no codons)
                     {
                     // if you change this text, make sure you also change hgTracks.js:mouseOverToLabel
                     // if you change the text below, also change hgTracks:mouseOverToExon
                     char *posNote = "";
                     char *exonOrIntron = "Intron";
                     if (isExon) 
                         {
                         posNote = "<b>Codons:</b> Zoom in to show cDNA position<br>";
                         exonOrIntron = "Exon";
                         }
 
 
                     safef(mouseOverText, sizeof(mouseOverText), "<b>Transcript:</b> %s<br>%s"
-                            "<b>Strand:</b> %c<br><b>%s:</b> %s %d of %d<br>%s",
-                        existingText, posNote, strandChar, exonOrIntron, exonIntronText, 
+                            "<b>Strand:</b> %c&nbsp;&nbsp;&nbsp;&nbsp;<b>Length:</b> %dbp<br><b>%s:</b> %s %d of %d<br>%s",
+                        existingText, posNote, strandChar, e - s, exonOrIntron, exonIntronText,
                         exonIntronNumber, numExonIntrons, phaseText);
 
                     // temporarily remove the mouseOver from the lf, since linkedFeatureMapItem will always 
                     // prefer a lf->mouseOver over the itemName
                     char *oldMouseOver = lf->mouseOver;
                     lf->mouseOver = NULL;
                     tg->mapItem(tg, hvg, item, mouseOverText, tg->mapItemName(tg, item),
                         sItem, eItem, sx, y, w, heightPer);
                     // and restore the old mouseOver
                     lf->mouseOver = oldMouseOver;
 
                     picStart = ex;  // prevent pileups. is this right? add 1? does it work?
                                     // JC: Why do we care about pileups?  First mapbox drawn wins.
                     }
                 }