diff --git a/tests/server/grab.cpp b/tests/server/grab.cpp
index 859f573..032c5cf 100644
--- a/tests/server/grab.cpp
+++ b/tests/server/grab.cpp
@@ -1256,6 +1256,120 @@ TEST_F(TouchGrabTest, GrabMultipleTouchpoints)
 }
 
 
+TEST_F(TouchGrabTest, MasterSlaveMixed)
+{
+    XORG_TESTCASE("Client A has a touch grab on root window\n"
+                  "Client B has no support for touch, and listens on its own window\n"
+                  "Client C uses touch on the slave device in its own window\n"
+                  "Trigger pointer-emulated button grab\n"
+                  "Client A rejects, pointer emulated to B, C listening on slave device\n"
+                  "Ungrab the button\n"
+                  "Trigger another touch event, observe B not getting button events\n"
+                  "https://bugs.freedesktop.org/show_bug.cgi?id=78345\n");
+
+    ::Display *dpy = Display();
+
+    ::Display *dpy2 = NewClient();
+    ::Display *dpy3 = NewClient();
+    Window win3 = /*CreateWindow(dpy3, DefaultRootWindow(dpy3));*/DefaultRootWindow(dpy3);
+    Window win2 = CreateWindow(dpy2, DefaultRootWindow(dpy2), 0, 0, 300, 300);
+
+    XIEventMask mask;
+    mask.mask_len = XIMaskLen(XI_LASTEVENT);
+    mask.deviceid = VIRTUAL_CORE_POINTER_ID;
+    mask.mask = new unsigned char[mask.mask_len]();
+
+    XISetMask(mask.mask, XI_TouchBegin);
+    XISetMask(mask.mask, XI_TouchUpdate);
+    XISetMask(mask.mask, XI_TouchEnd);
+    XISetMask(mask.mask, XI_TouchOwnership);
+
+    XIGrabModifiers mods = {};
+    mods.modifiers = XIAnyModifier;
+
+    XIGrabTouchBegin(dpy, VIRTUAL_CORE_POINTER_ID, DefaultRootWindow(dpy), 0, &mask, 1, &mods);
+
+    /* set up client B on the master device */
+    memset(mask.mask, 0, mask.mask_len);
+    XISetMask(mask.mask, XI_ButtonPress);
+    XISetMask(mask.mask, XI_ButtonRelease);
+    XISetMask(mask.mask, XI_Motion);
+    XISelectEvents(dpy2, win2, &mask, 1);
+
+    /* set up client C for touch on the slave device, without ownership events */
+    mask.deviceid = 6;
+    memset(mask.mask, 0, mask.mask_len);
+    XISetMask(mask.mask, XI_TouchBegin);
+    XISetMask(mask.mask, XI_TouchUpdate);
+    XISetMask(mask.mask, XI_TouchEnd);
+    XISelectEvents(dpy3, win3, &mask, 1);
+
+    /* run test */
+
+    XSetInputFocus(dpy2, win2, RevertToPointerRoot, CurrentTime);
+    ASSERT_TRUE(NoEventPending(dpy));
+    ASSERT_TRUE(NoEventPending(dpy2));
+    ASSERT_TRUE(NoEventPending(dpy3));
+
+    TouchBegin((int)(150. * 9.375), 20);
+    ASSERT_EVENT(XIDeviceEvent, tbegin, dpy, GenericEvent, xi2_opcode, XI_TouchBegin);
+    ASSERT_EVENT(XIDeviceEvent, towner, dpy, GenericEvent, xi2_opcode, XI_TouchOwnership);
+    ASSERT_TRUE(NoEventPending(dpy));
+
+    TouchUpdate((int)(200. * 9.375), 20);
+    ASSERT_EVENT(XIDeviceEvent, tupdate, dpy, GenericEvent, xi2_opcode, XI_TouchUpdate);
+    ASSERT_TRUE(NoEventPending(dpy));
+
+    EXPECT_EVENT(XIDeviceEvent, m0, dpy2, GenericEvent, xi2_opcode, XI_Motion);
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    XIAllowTouchEvents(dpy, tbegin->deviceid, tbegin->detail,
+                       DefaultRootWindow(dpy), XIRejectTouch);
+
+    ASSERT_EVENT(XIDeviceEvent, tend, dpy, GenericEvent, xi2_opcode, XI_TouchEnd);
+    ASSERT_TRUE(NoEventPending(dpy));
+
+    EXPECT_EVENT(XIDeviceEvent, m1, dpy2, GenericEvent, xi2_opcode, XI_Motion);
+    EXPECT_EVENT(XIDeviceEvent, b0, dpy2, GenericEvent, xi2_opcode, XI_ButtonPress);
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    ASSERT_EVENT(XIDeviceEvent, tbegin3, dpy3, GenericEvent, xi2_opcode, XI_TouchBegin);
+    ASSERT_EVENT(XIDeviceEvent, tupdate3, dpy3, GenericEvent, xi2_opcode, XI_TouchUpdate);
+    ASSERT_TRUE(NoEventPending(dpy3));
+
+    TouchEnd();
+    ASSERT_EVENT(XIDeviceEvent, tend3, dpy3, GenericEvent, xi2_opcode, XI_TouchEnd);
+    ASSERT_TRUE(NoEventPending(dpy3));
+
+    ASSERT_EVENT(XIDeviceEvent, m100, dpy2, GenericEvent, xi2_opcode, XI_Motion);
+    EXPECT_EVENT(XIDeviceEvent, b1, dpy2, GenericEvent, xi2_opcode, XI_ButtonRelease);
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    TouchBegin((int)(512 * 9.375), (512 * 9.375));
+
+    ASSERT_EVENT(XIDeviceEvent, tbegin2, dpy, GenericEvent, xi2_opcode, XI_TouchBegin);
+    ASSERT_EVENT(XIDeviceEvent, towner2, dpy, GenericEvent, xi2_opcode, XI_TouchOwnership);
+    ASSERT_TRUE(NoEventPending(dpy));
+
+    ASSERT_TRUE(NoEventPending(dpy));
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    XIAllowTouchEvents(dpy, tbegin2->deviceid, tbegin2->detail,
+                       DefaultRootWindow(dpy), XIRejectTouch);
+
+    ASSERT_EVENT(XIDeviceEvent, tend2, dpy, GenericEvent, xi2_opcode, XI_TouchEnd);
+    ASSERT_TRUE(NoEventPending(dpy));
+
+    EXPECT_EVENT(XIDeviceEvent, p1, dpy2, GenericEvent, xi2_opcode, XI_ButtonPress);
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    TouchEnd();
+    EXPECT_EVENT(XIDeviceEvent, m3, dpy2, GenericEvent, xi2_opcode, XI_ButtonRelease);
+    ASSERT_TRUE(NoEventPending(dpy2));
+
+    delete[] mask.mask;
+}
+
 class TouchGrabTestOnLegacyClient : public TouchGrabTest {
     virtual void SetUp() {
         SetDevice("tablets/N-Trig-MultiTouch.desc");