fix broken tutorial image links

do not replace ...step-xy inside <img links

diff --git a/doc/doxygen/scripts/filter b/doc/doxygen/scripts/filter
index 0f48f8f1a17993981ad5dfe06e39ebea1b5f0b24..afddfc4e62f56695295c77e8f1f9b347992902a4 100755 (executable)
--- a/doc/doxygen/scripts/filter
+++ b/doc/doxygen/scripts/filter
@@ -48,7 +48,7 @@ s/(::)?dealii::/::/g;
 #   @image commands.
 # - things in headings
 s/(?<![\"\\\/])step-(\d+)(?!\")/\@ref step_\1 \"step-\1\"/gi
-  if !m/(\@page|\@image|<h\d>)/i;
+  if !m/(\@page|\<img|\@image|<h\d>)/i;
 
 # If step-xx was explicitly escaped with a backslash, remove the
 # latter