Copy plastik window decoration to build directory

Summary:
This ensures that DontCrashAuroraeDestroyDecoTest can load the plastik
window decoration when run from build directory as it happens on
build.kde.org.

Test Plan: Test passes now when manipulating XDG_DATA_DIRS to hide system install

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D16745

autotests/integration/dont_crash_aurorae_destroy_deco.cpp

@@ -54,6 +54,7 @@ void DontCrashAuroraeDestroyDecoTest::initTestCase()
     if (!QFile::exists(QStringLiteral("/dev/dri/card0"))) {
         QSKIP("Needs a dri device");
     }
+    qputenv("XDG_DATA_DIRS", QCoreApplication::applicationDirPath().toUtf8());
     qRegisterMetaType<KWin::ShellClient*>();
     qRegisterMetaType<KWin::AbstractClient*>();
     QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);

plugins/kdecorations/aurorae/themes/plastik/CMakeLists.txt

@@ -6,3 +6,5 @@ install(DIRECTORY package/
 install(FILES package/metadata.desktop
         DESTINATION ${SERVICES_INSTALL_DIR}/${KWIN_NAME}
         RENAME kwin4_decoration_qml_plastik.desktop)
+
+file(COPY package/ DESTINATION ${CMAKE_BINARY_DIR}/bin/kwin/decorations/kwin4_decoration_qml_plastik)