Fix scrolling in mupdf and use back/forward buttons for page turns

mupdf-fixscrolling.patch

diff --git a/apps/pdfapp.c b/apps/pdfapp.c
index 887d823..37eed92 100644
--- a/apps/pdfapp.c
+++ b/apps/pdfapp.c
@@ -1402,7 +1402,8 @@ void pdfapp_onmouse(pdfapp_t *app, int x, int y, int btn, int modifiers, int sta
 		int newy = app->pany + y - app->sely;
 		/* Scrolling beyond limits implies flipping pages */
 		/* Are we requested to scroll beyond limits? */
-		if (newy + fz_pixmap_height(app->ctx, app->image) < app->winh || newy > 0)
+		/* if (newy + fz_pixmap_height(app->ctx, app->image) < app->winh || newy > 0) */
+		if (0) /* no, fuck this shit */
 		{
 			/* Yes. We can assume that deltay != 0 */
 			int deltay = y - app->sely;
diff --git a/apps/x11_main.c b/apps/x11_main.c
index 1c0ca0b..6cc205f 100644
--- a/apps/x11_main.c
+++ b/apps/x11_main.c
@@ -5,6 +5,7 @@
 #include <X11/Xatom.h>
 #include <X11/cursorfont.h>
 #include <X11/keysym.h>
+#include <X11/XF86keysym.h>
 
 #include <sys/select.h>
 #include <sys/time.h>
@@ -829,9 +830,16 @@ int main(int argc, char **argv)
 						break;
 
 					case XK_Left:
-						len = 1; buf[0] = 'b';
+						len = 1; buf[0] = 'h';
 						break;
 					case XK_Right:
+						len = 1; buf[0] = 'l';
+						break;
+
+					case XF86XK_Back:
+						len = 1; buf[0] = 'b';
+						break;
+					case XF86XK_Forward:
 						len = 1; buf[0] = ' ';
 						break;