scrollback: do not scroll up when already at the top ref. #57

patch/scrollback.c

@@ -26,6 +26,11 @@ kscrollup(const Arg* a)
 	int n = a->i;
 	if (n < 0)
 		n = term.row + n;
+	if (term.scr + n > term.histi)
+		n = term.histi - term.scr;
+
+	if (!n)
+		return;
 
 	if (term.scr <= HISTSIZE-n) {
 		term.scr += n;

patches.def.h

@@ -288,13 +288,9 @@
  *      not specific to this variant of st - the same issue is present in
  *      the xterm implementation. This is likely an issue of sixel height
  *      not being detected correctly.
- *    - If combined with the alpha patch sixel graphics disappear (become white)
- *      when transparent and rendered against a white background. This is believed
- *      to be related to how the sixel graphics use RGB colors instead of RGBA.
- *      A pull request or instructions for how to properly add alpha support for
- *      sixel graphics would be very welcome.
  *
  * Note that you need to uncomment the corresponding lines in config.mk when including this patch.
+ * This patch is incompatible with the W3M patch.
  *
  * https://gist.github.com/saitoha/70e0fdf22e3e8f63ce937c7f7da71809
  */