Coding Style: Clarify the use of the Q_OBJECT macro
Coding Style: Clarify the use of the Q_OBJECT macro

The old definition sounded like strong but was qualified by an big
'if' at the end, resulting in stating the obvious for a single case
("use it when you need it for qobject_cast").

Having the reminder there is ok, if it is a common thing to forget,
but it should be recognizable as such, and can include "the other
case" where it is typically used.

Change-Id: I0183a12d14c414db9ff8b19598cb9dd22cedda8e
Reviewed-by: Leena Miettinen <885fda02d52616fec24ed5fed9b3f0568fce3ead@theqtcompany.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@theqtcompany.com>

amyvmiwei/qt-creator,xianian/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,farseerri/git_code,kuba1/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,Distrotech/qtcreator,xianian/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,danimo/qt-creator,danimo/qt-creator,danimo/qt-creator,xianian/qt-creator,danimo/qt-creator,Distrotech/qtcreator,farseerri/git_code,danimo/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,kuba1/qtcreator,farseerri/git_code,Distrotech/qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,amyvmiwei/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,danimo/qt-creator,farseerri/git_code,Distrotech/qtcreator,farseerri/git_code,farseerri/git_code,danimo/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator