Not reproducible always.
I can reliably reproduce this on my machine: place the konsole app that owns plasma-shell so it covers where the widget explorer will be. start widget explorer. It appears to the right of konsole This doesn't seem to be reproducible with any other app/window. Makes little sense to me.
Git commit 27e5a2ab4638bb405fdf752ed688a776a5e62b1b by David Edmundson. Committed on 03/02/2014 at 15:46. Pushed by davidedmundson into branch 'master'. Fix multiscreen popup positioning This patch makes two changes: 1) don't rely on window()->screen() it's rubbish. 2) if the dialog is parented to a desktop, we want to position inside the parent, not outside the parent object REVIEW: 115448 M +43 -11 src/declarativeimports/core/dialog.cpp M +3 -0 src/declarativeimports/core/dialog.h http://commits.kde.org/plasma-framework/27e5a2ab4638bb405fdf752ed688a776a5e62b1b