[vdr] Cut marks editing problem

I'm editing a recording with some errors in it (errors of the kind "broken MPEG kills vdr-sxfe"). Looks like the index.vdr is broken, so I run genindex. After that, some existing cut marks are not on a GOP boundary any more (looks like genindex really has fixed something). I can't edit these cut marks any more. When I put the cursor on the broken mark, neither of 4 6 7 9 keys do anything. With 0 the mark is not deleted, rather a new one generated at the right position but I can't get rid of the broken mark.

Proposed fix: on the 7 and 9 keys, look if the mark is really on a GOP boundary, and if not, scan for the next one, adjusting the mark. This would also help with manual editing of the marks.vdr file.

Olaf