Brush up the imageviewer example

- Fix the save as file dialog being in "Open" mode by setting
acceptMode
- Fix clazy warnings about detaching QList by using constFirst()
- Fix clazy warning about passing a context to slot connection

Change-Id: I0c800e9829e118fcec477322aa2a13660e3b51d2
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
(cherry picked from commit fe1ef3ebcbfe017bdb01e16480a5c38cad6e39b9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/widgets/widgets/imageviewer/main.cpp b/examples/widgets/widgets/imageviewer/main.cpp
index 035c769693..fbfaecde45 100644
--- a/examples/widgets/widgets/imageviewer/main.cpp
+++ b/examples/widgets/widgets/imageviewer/main.cpp
@@ -63,7 +63,7 @@ int main(int argc, char *argv[])
     commandLineParser.process(QCoreApplication::arguments());
     ImageViewer imageViewer;
     if (!commandLineParser.positionalArguments().isEmpty()
-        && !imageViewer.loadFile(commandLineParser.positionalArguments().front())) {
+        && !imageViewer.loadFile(commandLineParser.positionalArguments().constFirst())) {
         return -1;
     }
     imageViewer.show();