Memory leak

Should plasmashell leak memory and take too much memory resources,
you can do in krunner:

Above is a workaround.

Bug reports:
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1587635
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1502556
https://bugs.kde.org/show_bug.cgi?id=344879#c122