Focus issue between text query block and query block navigation

• Open the search window.
• Ensure query builder is toggle on
• Add project search area
• Add `dir` query block.
• Try to navigate in the dir textfield. Often times using the the arrow to navigate will affect which query block is selected instead of chaning the cursor in the dir textfield.

Bug reported from this forum thread: https://discussions.unity.com/t/search-query-builder-has-broken-arrow-navigation/1646910/2

There seem to be a focus issue between the textfield and the searchwindow