I was able to use this workaround in kubuntu 16.04: I created a special Window Rule for the krunner window to enforce a certain screen position.
Details: In the system settings application, goto Workspace, Window Management, Window Rules
- create a new Window rule:
- Window class (application): choose "Exact Match" from the drop down list, enter:
krunner
into the field (or use the Detect Window Properties button)
- Window class (application): choose "Exact Match" from the drop down list, enter:
- on the second tab Size & Position:
- check the first box Position
- choose "Apply Initially"
- enter some numbers into the field: I entered
570,400
for about the middle of my screen (that may vary depending on the display)
- click OK
- click Apply
Anyway, this window is meant to be placed in the upper part of the screen - if set too close to the bottom, it will jump upward when the list of findings is long enough.