selecting text in the Palettes' search field

It’d be nice if we could double click the text string in the palettes search field—if there is text there—to select it (to then replace it with whatever we’re typing), as an alternative to clicking the "deletion X." As is now, 2ble clicking doesn’t select the text. (also, clicking the deletion X doesn’t then make the cursor active in the text field, as one would think it would.)