Although the text must be empty for the mode to change to plain text
mode, there still may be a non-default style for the temporary insert
style and style for the end of text run.

kernel32: Pass an output parameter when calling WriteConsoleOutputCharacterW and FillConsoleOutputAttribute.

winemenubuilder: Avoid passing a null pointer (or a non-pointer) to extract_icon in InvokeShellLinkerForURL.