fix two related bug Don't crash when there's a certificate mismatch and after saving the cert, before choosing to persist it, the page gets redirected; also, don't repeat the "Certificate mismatch" after the first yes, if there's a redirect. Now when the user accept a certificate, is treated as temporary saved for the whole session.

fix top_line/current_line wrt L_HIDDEN this fixes some infinite loops that may happen if the first line is hidden, or things happens. The idea is to move the line forward/backward until a non-hidden one is found.

add support for hidden lines; push-button now toggle pre blocks

retire restore_cursor and the force-redraw optimization (for now) don't consider restore_cursor as a public interface and while there rename it as restore_curs_x, as it describes better the behaviour of the function. I have to disable the buffer->force-redraw optimization, at least from now, given that cmd.c don't update curs_y anymore, and with that optimisation in place the cursor y position doesn't get updated upon redraw. Add a comment as a future note though.

drop unnecessary restore_cursor calls

restore early, restore often

handle the resize better Try to preserve as much as possible the current_line and top_line during wrap_page. In redraw_window recompute the correct y position.

optimisation: cache the top_line vline instead of using the line_off + vline_nth, cache the current top line.

move load_default_keys to defaults.c free ui.c from (strictly) non-ui code

add inc-fill-column and dec-fill-column

allow styling the minibuffer and modeline too

allow `bind map key cmd' in config file

move the list of cmd to its own file

keep the comment up-to-date we don't use wscrl (even though redraw_window could gain some speed by calling wscrl in some contexts)

added next/previous-heading