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In krunner you have the option to enable or disable individual runners, such as applications, recent documents, and contacts. But krunner is starting to be used by other applications now. For instance lancelot uses krunner for its search bar. These different instances of krunner might call for different collections of runners being available. However, the runner selection is currently global, it applies to all instances of krunner. It would be nice if you could enable and disable individual runner separately for different instances of krunner. That way you could select which runners you think are useful for each instance of krunner.

I think there is better solution.

Having different runners might mean duplication of data in ram (if they became separate) etc
It would be much better to have a black/white lists of runners to be used in each instance. So you could just application luncher to ignore amarok runner etc.

Such setting could also have option to prioritize results from different runners, liek in apploucher results from plication runner should have priority, and in alt+f2 address book could be in first place

Lukas have right. According to other idea of TheBlackCat kickof would give search criteria(categories) as parameter to KRuner.

I think there's matter with settings in plasma/kde4. I have matter with global settings on tray widget.

That would be one way to implement this. I didn't mean that there would be multiple krunner processes, one for each place it is used, although I suppose that is a second way to implement it. I was only saying the selection of individual runners would be different for each krunner search bar. How this would be implemented is up to the devs.