D11411: MPRIS control: fix instance indicator with multiple app instances

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: KDE Connect.
kossebau requested review of this revision.

REVISION SUMMARY
  Not sure what operator+ overload has been used exactly for the int,
  in any case it does not work as intended and needs e.g. an explicit
  QString::number() invocation.
  
  Also start with number 2 for duplicated instances.

TEST PLAN
  Start multiple instances of an MPRIS player (e.g. Gwenview). Before the
  second instance would get labelled with "Name []", with this patch it is
  labelled with "Name [2]".

REPOSITORY
  R224 KDE Connect

BRANCH
  fixmultiplemprisplayernumberindicator

REVISION DETAIL
  https://phabricator.kde.org/D11411

AFFECTED FILES
  plugins/mpriscontrol/mpriscontrolplugin.cpp

To: kossebau, #kde_connect
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