Comment 11 for bug 73965

Here you are:

- C-f : search for text,
- C-g: search for line.

For text, handles 'Match case' and 'Regexp' check boxes.

Search is circular and begins with line *following* the currently selected one.

This seems to be the more natural considering that we have no cursor inside the line.

Searching in a true text buffer is generally handled by having a cursor at "point" so you can find multiple occurrences in the same line.

As we use a ListStore here, it looked easier to slightly adapt the concept.