Handle multiple merges in gitgraph.js (#11996)

* Handle multiple merges in gitgraph.js

There is a bug in web_src/js/vendor/gitgraph.js whereby it fails to
handle multiple merges in a single commit correctly. This PR adds
changes to make this work.

Fix #11981

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update web_src/js/vendor/gitgraph.js

templates/repo/graph.tmpl

@@ -25,9 +25,7 @@
 								</code>
 								<strong> {{.Branch}}</strong>
 								<span>{{RenderCommitMessage .Subject $.RepoLink $.Repository.ComposeMetas}}</span> by
-		  <span class="author">
-		    {{.Author}}
-		  </span>
+								<span class="author">{{.Author}}</span>
 								<span class="time">{{.Date}}</span>
 							{{ end }}
 						</li>

web_src/js/vendor/gitgraph.js

@@ -65,7 +65,7 @@ export default function gitGraph(canvas, rawGraphList, config) {
 
     for (i = 0; i < l; i++) {
       midStr = rawGraphList[i].replace(/\s+/g, ' ').replace(/^\s+|\s+$/g, '');
-
+      midStr = midStr.replace(/(--)|(-\.)/g,'-')
       maxWidth = Math.max(midStr.replace(/(_|\s)/g, '').length, maxWidth);
 
       row = midStr.split('');
@@ -343,11 +343,6 @@ export default function gitGraph(canvas, rawGraphList, config) {
         return (val !== ' ' && val !== '_');
       }).length;
 
-      // do some clean up
-      if (flows.length > condenseCurrentLength) {
-        flows.splice(condenseCurrentLength, flows.length - condenseCurrentLength);
-      }
-
       colomnIndex = 0;
 
       // a little inline analysis and draw process
@@ -362,7 +357,7 @@ export default function gitGraph(canvas, rawGraphList, config) {
           continue;
         }
 
-        // inline interset
+        // inline intersect
         if ((colomn === '_' || colomn === '/')
           && currentRow[colomnIndex - 1] === '|'
           && currentRow[colomnIndex - 2] === '_') {
@@ -380,6 +375,7 @@ export default function gitGraph(canvas, rawGraphList, config) {
         color = flows[colomnIndex].color;
 
         switch (colomn) {
+          case '-':
           case '_':
             drawLineRight(x, y, color);
 
@@ -416,6 +412,11 @@ export default function gitGraph(canvas, rawGraphList, config) {
 
       y -= config.unitSize;
     }
+
+    // do some clean up
+    if (flows.length > condenseCurrentLength) {
+      flows.splice(condenseCurrentLength, flows.length - condenseCurrentLength);
+    }
   };
 
   init();