Add support for horizontal scroll wheel. (Bjorn Winckler)
diff --git a/src/misc1.c b/src/misc1.c
index fb04fb6..9371760 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -3158,6 +3158,8 @@
 		    || n == K_RIGHTRELEASE
 		    || n == K_MOUSEDOWN
 		    || n == K_MOUSEUP
+		    || n == K_MOUSELEFT
+		    || n == K_MOUSERIGHT
 		    || n == K_X1MOUSE
 		    || n == K_X1DRAG
 		    || n == K_X1RELEASE