Bookmark loses track of correct line

[jasondunsmore]

Follow these steps and the bookmark will lose track of the correct line number to jump to:

1. Create a new file with 4 lines
2. Put a bookmark on lines 1 and 3
3. With the cursor at the beginning of line 3, insert a newline
4. Call bm-next and bm-previous to see that the second bookmark is now on the unmarked line. Also, notice that wrapping doesn't work with bm-next. It only works with bm-previous.

[joodland]

The marker stored on the overlay is not updated when inserting a newline at the start of a bookmark. Bug in Emacs?

This resulted in jumping to a position just outside (the line above) the bookmark. The bug is only visible when "bm-goto-position" is true and the bookmark was created standing in column 0.

The solution was to only jump to positions when it is between the overlay start and end.