[graphics/krita] libs/image/tests: ifdef test that only builds with qt6.

Git commit 4ba3fc98d99807e1f8996c2f5cc2989f4c441876 by Wolthera van Hövell tot Westerflier.
Committed on 17/08/2026 at 11:36.
Pushed by woltherav into branch 'master'.

ifdef test that only builds with qt6.

M  +2    -0    libs/image/tests/kis_image_test.cpp

https://invent.kde.org/graphics/krita/-/commit/4ba3fc98d99807e1f8996c2f5cc2989f4c441876

diff --git a/libs/image/tests/kis_image_test.cpp b/libs/image/tests/kis_image_test.cpp
index 515f9553259..2d5895c1ad4 100644
--- a/libs/image/tests/kis_image_test.cpp
+++ b/libs/image/tests/kis_image_test.cpp
@@ -1381,6 +1381,7 @@ void KisImageTest::testHdrReferenceWhite_data()
 
 void KisImageTest::testHdrReferenceWhite()
 {
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     auto optionalFromDouble = [] (double value) {
         return value >= 0 ? std::make_optional(value) : std::optional<double>();
     };
@@ -1409,6 +1410,7 @@ void KisImageTest::testHdrReferenceWhite()
     image->waitForDone();
 
     QCOMPARE(image->hdrReferenceWhiteLightLevel(), optionalFromDouble(expectedDstHdrReferenceWhite));
+#endif
 }
 
 void KisImageTest::testHdrReferenceWhiteCloning()