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

[Éric Brunet]

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

--- Comment #19 from Éric Brunet <eric.brunet at lps.ens.fr> ---
It would be great to re-enable for everybody the number of unread mails on the
icon. This is such an obvious feature! When I look at my phone, I have the
number of missed calls, the number of SMS and the number of emails on the icons
of the respective apps.

I am not sure what as the problem with High dpi displays, but I did run into a
difficulty when writing the patch: kmail needs to know the size of the icon. It
obtains a size with 

             const int overlaySize = IconSize(KIconLoader::Panel);

but it is not the correct size. I don't know what is the correct way of
querying plasma to obtain the size of the icons in the SystemTray. But I am
sure it is possible and that the High dpi case can be fixed. If needed, I am
willing to help, and I am also willing to answer bug reports for this feature.

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