Hi

Long time ago I have found very annoing bug. The bookmark disappears regularly.
Reproduce:
1) Set bookmark to current text line using hotkey. As example press Ctrl-K-1
2) Press Shift-Right. Press Delete.

Ups. Bookmark disappeared. Similar behavior appears in some other scenarios. As example:

1) Set Bookmark to middle line of the commented out text
2) Select all lines of this commented text
3) Press Delete

Bookmark disappeared again.

Can You fix this?
Thanks