I've tried to change order of layouts at Layout tab and it helps. I.e.
in case the USA layout is lower than RUS the switch and indicator works
as expected. Obviously this workaround is not a solution. The USA layout
as default is better in most cases.
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The first attempt to switch keyboard layou
If run gnome-settings-daemon with --debug --no-daemon options then open
new window (gedit for example) and switch layout (I used CapsLock
shortcut). The Caps LED shows switched layout, the layout is actually
switched but indicator applet shows previous layout.
The gnome-settings-daemon show in co