So there's this (pretty old) feature request to show notification when keyboard layout is switched (https://bugs.kde.org/show_bug.cgi?id=66641). It's not too hard to implement that (although the KStatusNotifierItem is a bit limited in how the notifications can be set). But there's couple of questions I have and although it has 45 votes nobody replied in the bug so far so I'll post them here:
1) when keyboard switcher is in "by application" or "by window" mode and active window changes also switching current layout, would you want to see
notification as well? Or shall the notification be shown only for "manual" layout change? I would think you don't want that popup show every time you
switch the window, but then if you don't see the tray you would not know if layout changed...
of course we can add new UI option but there's quite a bit of them already so I would rather not unless I have to
2) would you care to set the notification timeout? or shall it just use some "system default" one? again the less new UI options the better, unless it's