view: make zb command more robust

The new approach first scrolls the window up such that the current
cursor line lies below the current visible area, then the viewport
is adjusted until the line is once again visible (at the bottom of
the window).

Closes #85

1 files changed, 2 insertions, 4 deletions

diff --git a/view.c b/view.c
index e7f9d4d..0491c78 100644
--- a/view.c
+++ b/view.c
@@ -707,11 +707,9 @@ void view_redraw_bottom(View *view) {
 	Line *line = view->cursor->line;
 	if (line == view->lastline)
 		return;
-	int linenr = 0;
 	size_t pos = view->cursor->pos;
-	for (Line *cur = view->topline; cur && cur != line; cur = cur->next)
-		linenr++;
-	view_slide_down(view, view->height - linenr - 1);
+	view_viewport_up(view, view->height);
+	while (pos > view->end && view_viewport_down(view, 1));
 	view_cursor_to(view, pos);
 }