[kmail2] [Bug 377521] regression: system tray icon no longer shows number of new mails

[Kamil Dudka]

https://bugs.kde.org/show_bug.cgi?id=377521

--- Comment #25 from Kamil Dudka <kdudka at redhat.com> ---
Comment on attachment 114942
  --> https://bugs.kde.org/attachment.cgi?id=114942
patch to reenable numbers, v18.04.3

I am not able to compile kmail-18.12.3 with this patch against up2date qt.  The
build fails with this error:

/var/tmp/paludis/kde-apps-kmail-18.12.3/work/kmail-18.12.3/src/kmsystemtray.cpp:
In member function 'void KMail::KMSystemTray::updateCount(int)':
/var/tmp/paludis/kde-apps-kmail-18.12.3/work/kmail-18.12.3/src/kmsystemtray.cpp:175:31:
error: 'class QFontMetrics' has no member named 'width'; did you mean
'maxWidth'?
         const int width = qfm.width(count < 100 ? QStringLiteral("99")
                               ^~~~~
                               maxWidth

I was able to google up a page saying that QFontMetrics::width() is obsolete:

    https://doc.qt.io/qt-5/qfontmetrics-obsolete.html

... but the page does not suggest any replacement for that method.

Any idea how to make it build again?

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