Fix compiling on Qt 5.12 (clipboard lambda)

src/gui/Popups/ConfirmClipboardUploadPopup.qml

@@ -3,9 +3,12 @@
 import QtQuick 2.12
 import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.12
-import Clipboard 0.1
 import "../Base"
 import "../Base/Buttons"
+//
+// Make sure to initialize the image provider by
+// importing this first:
+import Clipboard 0.1
 
 HColumnPopup {
     id: popup

src/main.cpp

@@ -145,13 +145,6 @@ int main(int argc, char *argv[]) {
     objectContext->setContextProperty("debugMode", false);
 #endif
 
-    Clipboard *clipboard = new Clipboard();
-
-    // Register out custom image providers.
-    // QML will be able to request an image from them by setting an
-    // `Image`'s `source` to `image://<providerId>/<id>`
-    engine.addImageProvider("clipboard",new ClipboardImageProvider(clipboard));
-
     // Register our custom non-visual QObject singletons,
     // that will be importable anywhere in QML. Example:
     //     import Clipboard 0.1
@@ -159,9 +152,18 @@ int main(int argc, char *argv[]) {
     //     Component.onCompleted: print(Clipboard.text)
     qmlRegisterSingletonType<Clipboard>(
         "Clipboard", 0, 1, "Clipboard",
-        [clipboard](QQmlEngine *engine, QJSEngine *scriptEngine) -> QObject * {
-            Q_UNUSED(engine)
+        [](QQmlEngine *engine, QJSEngine *scriptEngine) -> QObject * {
             Q_UNUSED(scriptEngine)
+
+            Clipboard *clipboard = new Clipboard();
+
+            // Register out custom image providers.
+            // QML will be able to request an image from them by setting an
+            // `Image`'s `source` to `image://<providerId>/<id>`
+            engine->addImageProvider(
+                "clipboard", new ClipboardImageProvider(clipboard)
+            );
+
             return clipboard;
         }
     );