system tray layout

[Mathias Kraus]

hi,

there seems to be a bug in the system tray with a vertical panel. instead 
grouping the items side by side, they are stacked, so that much space is 
wasted.
the problem seems to be also in a horizontal panel. there are only two rows 
even if there is space for much more rows.

the following patch solves the problem. ok to commit?

mathias
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