From f7eb2492d977b4779215b9fae33efd100743af6e Mon Sep 17 00:00:00 2001
From: grossmj <grossmj@gns3.net>
Date: Fri, 12 Jan 2024 16:18:32 +1100
Subject: [PATCH] Fix mouse offset issues with VNC in Qemu. Fixes #2335

---
 gns3server/compute/qemu/qemu_vm.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gns3server/compute/qemu/qemu_vm.py b/gns3server/compute/qemu/qemu_vm.py
index 94b50114..63eac753 100644
--- a/gns3server/compute/qemu/qemu_vm.py
+++ b/gns3server/compute/qemu/qemu_vm.py
@@ -2426,6 +2426,9 @@ class QemuVM(BaseNode):
                 command.extend(shlex.split(additional_options))
             except ValueError as e:
                 raise QemuError("Invalid additional options: {} error {}".format(additional_options, e))
+        # avoiding mouse offset (see https://github.com/GNS3/gns3-server/issues/2335)
+        if self._console_type == "vnc":
+            command.extend(['-machine', 'usb=on', '-device', 'usb-tablet'])
         return command
 
     def __json__(self):