Move the Q_DECLARE_OPERATORS_FOR_FLAGS macro declaration for the
DecodingOption enum to the Konsole namespace. This should fix a bug that
happens when KeyboardTranslator.h is included in Screen.h (either
directly or indirectly), where the compiler doesn't find the |() operator
of the QFlags class.

I haven't pinpointed where the conflicting |() operator is coming from
exactly, but moving the macro declaration to the Konsole namespace
matches how other QFlags are used through out the code (and matches
upstream doc examples).

• Add this include to Screen.h and try to compile: #include "KeyboardTranslator.h"

• The compilation fails in SessionController.cpp:

error: invalid conversion from 'int' to 'Konsole::Screen::DecodingOption'
The line it fails on is 1200:
QString selectedText = _view->screenWindow()->selectedText(Screen::PreserveLineBreaks | Screen::TrimLeadingWhitespace | Screen::TrimTrailingWhitespace);

• Apply the diff and build again, the build should complete

I tested the options from the DecodingOption enum from the Screen class and they still work as before