Currently, to navigate the list of results after typing a search term, you need to press the down arrow twice: first to focus the result list, and a second time to actually change the selection. This patch fixes that by changing the selection during the focus oprtation.

BUG: 392197

Deployed change, killed, restarted, and activated KRunner, typed a search term:

• The down arrow key now moves to the second item
• Clicked on the text field; up arrow now moves to the previous item in the results list

Activating the Open Containing Folder button for the first result via the keyboard changes slightly with this patch:

• Currently, it's down arrow → tab key
• With this patch, it's tab key three times or down arrow → shift + tab

Seems like an acceptable change to me to better support the common case of just wanting to easily navigate to the results list items.