Build failure against Qt 5.14 (missing header)

[a17r]

Brief description of the issue.

Probably due to some header cleanup, build fails without including QKeyEvent to (at least) messagepreviewer.cpp.

How to reproduce the bug?

Try to build against Qt-5.14.0.

What actually happened?

build.log

gui/messagepreviewer.cpp: In member function ‘virtual bool MessagePreviewer::eventFilter(QObject*, QEvent*)’:
gui/messagepreviewer.cpp:206:57: error: invalid static_cast from type ‘QEvent*’ to type ‘QKeyEvent*’
  206 |     QKeyEvent* key_event = static_cast<QKeyEvent*>(event);
      |                                                         ^
In file included from /usr/include/qt5/QtWidgets/QWidget:1,
                 from ./gui/messagepreviewer.h:6,
                 from gui/messagepreviewer.cpp:3:
/usr/include/qt5/QtWidgets/qwidget.h:75:7: note: class type ‘QKeyEvent’ is incomplete
   75 | class QKeyEvent;
      |       ^~~~~~~~~
gui/messagepreviewer.cpp:208:18: error: invalid use of incomplete type ‘class QKeyEvent’
  208 |     if (key_event->matches(QKeySequence::StandardKey::Find)) {
      |                  ^~
In file included from /usr/include/qt5/QtWidgets/QWidget:1,
                 from ./gui/messagepreviewer.h:6,
                 from gui/messagepreviewer.cpp:3:
/usr/include/qt5/QtWidgets/qwidget.h:75:7: note: forward declaration of ‘class QKeyEvent’
   75 | class QKeyEvent;
      |       ^~~~~~~~~
make[1]: *** [Makefile:6510: messagepreviewer.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/var/tmp/portage/net-news/rssguard-9999/work/rssguard-9999/src/librssguard'
make: *** [Makefile:48: sub-src-librssguard-make_first-ordered] Error 2

[martinrotter]

should be fixed now