[xml-hint addon] Prevent extraneous quote

If typing attribute=" and by closetag it becomes attribute="" and user
presses Ctrl-Space to autocomplete and the completion is "x" then by
this fix instead of obnoxious attribute="x"" it becomes nice attribute="x".

Author: srguiwiz

addon/hint/xml-hint.js

@@ -92,6 +92,10 @@
             quote = token.string.charAt(len - 1);
             prefix = token.string.substr(n, len - 2);
           }
+          if (n) { // an opening quote
+            var line = cm.getLine(cur.line);
+            if (line.length > token.end && line.charAt(token.end) == quote) token.end++; // include a closing quote
+          }
           replaceToken = true;
         }
         for (var i = 0; i < atValues.length; ++i) if (!prefix || matches(atValues[i], prefix, matchInMiddle))