Fix compile warnings from tests

Use streaming operators for debug/warnings to avoid qsizehint/int
conflicts.
Don't ignore return values from [[no_discard]] functions.
Don't copy elements from containers that return references.
Remove unused variables.

Change-Id: I7a0bef94a5e828bd8facee0c625ec48c3d1f1bdb
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
index 9aed54b487..6c7c84c0cf 100644
--- a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
+++ b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
@@ -792,7 +792,7 @@ void tst_qquickflickable::resizeContent()
     QSizeChangeListener sizeListener(fp->contentItem);
 
     QMetaObject::invokeMethod(root, "resizeContent");
-    for (const QSize sizeOnGeometryChanged : sizeListener) {
+    for (const QSize &sizeOnGeometryChanged : sizeListener) {
         // Check that we have the correct size on all signals
         QCOMPARE(sizeOnGeometryChanged, QSize(600, 600));
     }