Revert "XCB: Do not create instance of QPlatformIntegration for invalid displays"

This reverts commit 67cc8fea106c35c7ca75bf476667d07b3bbf3257.

I forgot about this patch and now it makes rebasing the local changes
too time-consuming. Besides, 67cc8fea10 broke a build for -no-xcb-xlib.
I will restore this patch, with adaptations to the new QXcb*Connection
hierarchy.

Task-number: QTBUG-68859
Change-Id: I938f32b5da22ce18f95d761f9b34e77fff923e24
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>

1 files changed, 3 insertions, 9 deletions

diff --git a/src/plugins/platforms/xcb/qxcbmain.cpp b/src/plugins/platforms/xcb/qxcbmain.cpp
index 539d033ca9..f8cb9a9269 100644
--- a/src/plugins/platforms/xcb/qxcbmain.cpp
+++ b/src/plugins/platforms/xcb/qxcbmain.cpp
@@ -52,16 +52,10 @@ public:
 
 QPlatformIntegration* QXcbIntegrationPlugin::create(const QString& system, const QStringList& parameters, int &argc, char **argv)
 {
-    if (!system.compare(QLatin1String("xcb"), Qt::CaseInsensitive)) {
-        QXcbIntegration *xcbIntegration = new QXcbIntegration(parameters, argc, argv);
-        if (!xcbIntegration->hasDefaultConnection()) {
-            delete xcbIntegration;
-            return nullptr;
-        }
-        return xcbIntegration;
-    }
+    if (!system.compare(QLatin1String("xcb"), Qt::CaseInsensitive))
+        return new QXcbIntegration(parameters, argc, argv);
 
-    return nullptr;
+    return 0;
 }
 
 QT_END_NAMESPACE