xcb: try to repopulate xinput2 devices when needed

And try to not call Q_ASSERT() to avoid crash.

Fixes: QTBUG-123554
Pick-to: 6.7 6.6 6.5
Change-Id: I9443c5f0ab4ca7a858df9b328f517b48ab8f122d
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index c94b3edb69..4f62a1880b 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -813,7 +813,16 @@ void QXcbConnection::xi2ProcessTouch(void *xiDevEvent, QXcbWindow *platformWindo
 {
     auto *xiDeviceEvent = reinterpret_cast<xcb_input_touch_begin_event_t *>(xiDevEvent);
     TouchDeviceData *dev = touchDeviceForId(xiDeviceEvent->sourceid);
-    Q_ASSERT(dev);
+    if (!dev) {
+        qCDebug(lcQpaXInputEvents) << "didn't find the dev for given sourceid - " << xiDeviceEvent->sourceid
+            << ", try to repopulate xi2 devices";
+        xi2SetupDevices();
+        dev = touchDeviceForId(xiDeviceEvent->sourceid);
+        if (!dev) {
+            qCDebug(lcQpaXInputEvents) << "still can't find the dev for it, give up.";
+            return;
+        }
+    }
     const bool firstTouch = dev->touchPoints.isEmpty();
     if (xiDeviceEvent->event_type == XCB_INPUT_TOUCH_BEGIN) {
         QWindowSystemInterface::TouchPoint tp;