I can confirm this on Kubuntu Vivid with Plasma 5.
** Changed in: transmission (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1212839
Title:
transmission-qt:
I just noticed, that the icon is in fact not missing, but located right
next to the dash, under the menu bar (see the attached screenshot). The
icon works as expected from a tray icon.
** Attachment added: Screenshot from 2013-08-15 23:17:13.png