We have a rather modularised application where a core library allows opening a file save dialog. While writing a test, I tried popping up the file dialog, set a predetermined file name, then check if that value was propagated properly across the layers in the application.

This is on Windows, so I tried
```
dialog->selectFile(QDir::toNativeSeparators(file.fileName()));
```
However, this dialog that opens, does not have native separators, resulting in the test failing, because hitting enter results in Windows telling me I entered an invalid path.

I tried creating a simple example that shows the issue. It tried to strip as much as possible.