Controls: Move QtQuick.Controls.impl import to QtQuick.Controls.Basic

We want it to be available in all the individual styles, not only if you
import QtQuick.Controls.

Fixes: QTBUG-104768
Fixes: QTBUG-109299
Pick-to: 6.5
Change-Id: Id483ee9f721e0c820bed638702a4a8aced759063
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/quickcontrols/CMakeLists.txt

@@ -12,8 +12,6 @@ qt_internal_add_qml_module(QuickControls2
     DESIGNER_SUPPORTED
     CLASS_NAME QtQuickControls2Plugin
     PLUGIN_TARGET qtquickcontrols2plugin
-    IMPORTS
-        QtQuick.Controls.impl/auto
     OPTIONAL_IMPORTS
         QtQuick.Controls.Fusion/auto
         QtQuick.Controls.Material/auto

src/quickcontrols/basic/CMakeLists.txt

@@ -155,6 +155,8 @@ qt_internal_add_qml_module(qtquickcontrols2basicstyleplugin
     CLASS_NAME QtQuickControls2BasicStylePlugin
     DEPENDENCIES
         QtQuick/auto
+    IMPORTS
+        QtQuick.Controls.impl/auto
     PLUGIN_TARGET qtquickcontrols2basicstyleplugin
     NO_PLUGIN_OPTIONAL
     NO_GENERATE_PLUGIN_SOURCE

tests/auto/quickcontrols/styleimports/tst_styleimports.cpp

@@ -13,6 +13,7 @@
 #include <QtQuickControls2/qquickstyle.h>
 #include <QtQuickControls2/private/qquickstyle_p.h>
 #include <QtQuickControls2Impl/private/qquickiconlabel_p.h>
+#include <QtQuickControlsTestUtils/private/qtest_quickcontrols_p.h>
 
 class tst_StyleImports : public QQmlDataTest
 {
@@ -34,6 +35,9 @@ private slots:
 
     void fallbackStyleShouldNotOverwriteTheme_data();
     void fallbackStyleShouldNotOverwriteTheme();
+
+    void attachedTypesAvailable_data();
+    void attachedTypesAvailable();
 };
 
 tst_StyleImports::tst_StyleImports()
@@ -241,6 +245,54 @@ void tst_StyleImports::fallbackStyleShouldNotOverwriteTheme()
     QCOMPARE(contentItem->color(), expectedContentItemColor);
 }
 
+void tst_StyleImports::attachedTypesAvailable_data()
+{
+    QTest::addColumn<QString>("import");
+
+    // QtQuick.Controls import.
+    QTest::newRow("Controls") << "";
+
+    const QStringList styles = testStyles();
+    for (const QString &styleImport : styles)
+        QTest::newRow(qPrintable(styleImport)) << styleImport;
+}
+
+void tst_StyleImports::attachedTypesAvailable()
+{
+    QFETCH(QString, import);
+
+    // If it's QtQuick.Controls, don't prepend anything.
+    if (!import.isEmpty())
+        import.prepend(QLatin1Char('.'));
+
+    // Should not warn about missing types.
+    QTest::failOnWarning(QRegularExpression(".?"));
+
+    QQmlEngine engine;
+    QQmlComponent c(&engine);
+    c.setData(QString::fromLatin1(R"(
+        import QtQuick
+        import QtQuick.Controls%1
+
+        Item {
+            SplitView {
+                handle: Rectangle {
+                    opacity: SplitHandle.hovered || SplitHandle.pressed ? 1.0 : 0.0
+                }
+                Item {} // Need these to ensure the handle is actually created, otherwise we won't get warnings.
+                Item {}
+            }
+
+            Dialog {
+                anchors.centerIn: Overlay.overlay
+            }
+        }
+    )").arg(import).toLatin1(), QUrl());
+    QVERIFY2(c.isReady(), qPrintable(c.errorString()));
+    QScopedPointer<QObject> o(c.create());
+    QVERIFY(!o.isNull());
+}
+
 QTEST_MAIN(tst_StyleImports)
 
 #include "tst_styleimports.moc"