Improvement of line count for e.g. warnings

When having a file like (but extended example based on a problem found in CGAL where line numbers were a bit off):
```
/*!  The <hr2> class `Face_filtered_graph` is an adaptor that creates a filtered view of a graph */
struct Face_filtered_graph_no_det
{
 /*!
   * \brief constructs an empty face filtered graph (no face is selected)
   *
   *
   *
   *
   *
   *
   *
   *
   * <table class="params">
   *   something
   *   something
   * </table>
   *
   *
   *
   *
   *
   *
   *
   *
   * <table class="params">
   *   something
   *   something
   * </table>
   */
  Face_filtered_graph_no_det();
}
```
we get:
```
.../no_det.h:1: warning: Unsupported xml/html tag <hr2> found
.../no_det.h:5: warning: expected <tr> tag but found TK_LNKWORD token instead!
.../no_det.h:17: warning: expected <tr> tag but found TK_LNKWORD token instead!
```
instead of:
```
.../no_det.h:1: warning: Unsupported xml/html tag <hr2> found
.../no_det.h:14: warning: expected <tr> tag but found TK_LNKWORD token instead!
.../no_det.h:26: warning: expected <tr> tag but found TK_LNKWORD token instead!
```

Line counting is in an interpreter, especially when merging blocks etc.) a difficult situation.

- `util.cpp`: `\ilinebr` is an internal newline, but the line count should not be increased
- `commentscan.l`
   - put empty lines in output as well otherwise they are missing in the line count
   - don't insert `\n` to separate blocks, but use the artificial `\ilinebr`
   - properly initialize the `docLine` (important for examples were at the beginning of the block there are a number of newlines

1 files changed, 1 insertions, 1 deletions

diff --git a/src/util.cpp b/src/util.cpp
index 2c7af7b..fb7a8dc 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -6580,7 +6580,7 @@ QCString stripLeadingAndTrailingEmptyLines(const QCString &s,int &docLine)
   while ((c=*p))
   {
     if (c==' ' || c=='\t' || c=='\r') i++,p++;
-    else if (c=='\\' && qstrncmp(p,"\\ilinebr",8)==0) i+=8,li=i,docLine++,p+=8;
+    else if (c=='\\' && qstrncmp(p,"\\ilinebr",8)==0) i+=8,li=i,p+=8;
     else if (c=='\n') i++,li=i,docLine++,p++;
     else break;
   }