This code seems to be used by vmport hack, passing these values allows
to implement horizontal scroll support even when using vmport.
In case it's not supported horizontal scroll will act as a vertical one.

Signed-off-by: Dmitry Petrov <dpetroff@gmail.com>
---
 ui/input-legacy.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/ui/input-legacy.c b/ui/input-legacy.c
index 9fc78a639b..46ea74e44d 100644
--- a/ui/input-legacy.c
+++ b/ui/input-legacy.c
@@ -23,6 +23,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/log.h"
 #include "qapi/qapi-commands-ui.h"
 #include "ui/console.h"
 #include "keymaps.h"
@@ -179,6 +180,20 @@ static void legacy_mouse_event(DeviceState *dev, QemuConsole *src,
                                     1,
                                     s->buttons);
         }
+        if (btn->down && btn->button == INPUT_BUTTON_WHEEL_RIGHT) {
+            s->qemu_put_mouse_event(s->qemu_put_mouse_event_opaque,
+                                    s->axis[INPUT_AXIS_X],
+                                    s->axis[INPUT_AXIS_Y],
+                                    -2,
+                                    s->buttons);
+        }
+        if (btn->down && btn->button == INPUT_BUTTON_WHEEL_LEFT) {
+            s->qemu_put_mouse_event(s->qemu_put_mouse_event_opaque,
+                                    s->axis[INPUT_AXIS_X],
+                                    s->axis[INPUT_AXIS_Y],
+                                    2,
+                                    s->buttons);
+        }
         break;
     case INPUT_EVENT_KIND_ABS:
         move = evt->u.abs.data;
-- 
2.32.0