fix: Fixed comment folding bugs for html (xml like languages) (#4910)

Author: anijanyan

src/edit_session/folding.js

@@ -593,12 +593,12 @@ function Folding() {
             if (dir != 1) {
                 do {
                     token = iterator.stepBackward();
-                } while (token && re.test(token.type));
-                iterator.stepForward();
+                } while (token && re.test(token.type) && !/^comment.end/.test(token.type));
+                token = iterator.stepForward();
             }
 
             range.start.row = iterator.getCurrentTokenRow();
-            range.start.column = iterator.getCurrentTokenColumn() + 2;
+            range.start.column = iterator.getCurrentTokenColumn() + (/^comment.start/.test(token.type) ? token.value.length : 2);
 
             iterator = new TokenIterator(this, row, column);
 
@@ -613,13 +613,16 @@ function Folding() {
                     } else if (iterator.$row > lastRow) {
                         break;
                     }
-                } while (token && re.test(token.type));
+                } while (token && re.test(token.type) && !/^comment.start/.test(token.type));
                 token = iterator.stepBackward();
             } else
                 token = iterator.getCurrentToken();
 
             range.end.row = iterator.getCurrentTokenRow();
-            range.end.column = iterator.getCurrentTokenColumn() + token.value.length - 2;
+            range.end.column = iterator.getCurrentTokenColumn();
+            if (!/^comment.end/.test(token.type)) {
+                range.end.column += token.value.length - 2;
+            }
             return range;
         }
     };