[stabline] [BUG]: The view on filenames doesn't move with the cursor

[bogdan-the-great]

Previously referenced in issue #60.

The view (currently focused on buffer and others around it) doesn't move with the cursor (currently focused on buffer) so it doesn't show buffers that are not visible because of the screen width.

The cursor is at the leftmost buffer, but the whole view doesn't shift to the right to reveal its filename.

[tamton-aquib]

Good catch, I'll start fixing this.