view: make sure viewport remains valid when scrolling up

In a file with windows style \r\n line endings scrolling
up would wrap around to the end of the file.

1 files changed, 1 insertions, 1 deletions

diff --git a/view.c b/view.c
index d681656..db9a8a6 100644
--- a/view.c
+++ b/view.c
@@ -664,7 +664,7 @@ bool view_viewport_up(View *view, int n) {
 	} while (text_iterator_byte_prev(&it, &c));
 	if (c == '\r')
 		off++;
-	view->start -= off;
+	view->start -= MIN(view->start, off);
 	view_draw(view);
 	return true;
 }