Allow target path version in a parent module

For example, the QML Engine is now able to locate QtQml.Models 2.x
in both of the following target/installation paths:

- QT_INSTALL_QML/QtQml/Models.2
- QT_INSTALL_QML/QtQml.2/Models

This is required for QtQuick Controls 2. The target path of the module
is QT_INSTALL_QML/QtQuick/Controls.2. The built-in styles are installed
as sub-directories to be able to locate them from the controls module.

Some of the built-in styles provide their own C++ extensions via style-
specific imports (eg. the Material attached property is imported from
QtQuick.Controls.Material 2.0). The problem is that the QML Engine does
not find the module from QT_INSTALL_QML/QtQuick/Controls.2/Material,
but requires it to be installed outside the main controls module ie.
QT_INSTALL_QML/QtQuick/Controls/Material(.2). This makes it a) hard to
locate the styles from the main controls module, and b) conflicts with
the target path of QtQuick Controls 1.

[ChangeLog][QtQml] Made the QML Engine capable of locating QML sub-
modules from within a versioned parent module path. For example,
QtQml.Models 2.x can be either in QT_INSTALL_QML/QtQml/Models.2 or
in QT_INSTALL_QML/QtQml.2/Models.

Change-Id: I2fe4bbdd6d04dd1e80cbe9b3e7e02617658a0756
Task-number: QTBUG-52556
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlmoduleplugin/data/child21.qml b/tests/auto/qml/qqmlmoduleplugin/data/child21.qml
new file mode 100644
index 0000000000..064d5474e0
--- /dev/null
+++ b/tests/auto/qml/qqmlmoduleplugin/data/child21.qml
@@ -0,0 +1,3 @@
+import org.qtproject.AutoTestQmlPluginType.ChildPlugin 2.1
+
+MyChildPluginType { valueOnlyIn2: 123 }