Select any existing filter/search value when using / shortcut key
Generally I want to filter or search on an entirely new value when heading back up to the search/filter text box. If there's an existing filter in effect I have to hit Ctrl/Cmd + A to Select All (or click+drag to select) then click backspace or delete. If the existing text was selected at the time the shortcut key was pressed, it would cut out the middle step. If you did want to modify the existing search term you could just use the arrow keys to cancel the selection.