Minor fix for some environments that don't have QT_QPA_PLATFORM defined

Author: AdrianTM

main.cpp

@@ -40,6 +40,13 @@ void messageHandler(QtMsgType type, const QMessageLogContext &context, const QSt
 
 int main(int argc, char *argv[])
 {
+    // Set Qt platform to XCB (X11) if not already set and we're in X11 environment
+    if (qEnvironmentVariableIsEmpty("QT_QPA_PLATFORM")) {
+        if (!qEnvironmentVariableIsEmpty("DISPLAY") && qEnvironmentVariableIsEmpty("WAYLAND_DISPLAY")) {
+            qputenv("QT_QPA_PLATFORM", "xcb");
+        }
+    }
+
     QApplication a(argc, argv);
 
     if (a.arguments().contains("--version") || a.arguments().contains("-v") ) {