Function search_chord 

pub fn search_chord(
    event: &WindowEvent,
    modifiers: ModifiersState,
    platform: PlatformConventions,
) -> Option<SearchOpening>

What a key press asks of the window’s search on platform: Find (Ctrl+F, ⌘F), or Find and Replace (Ctrl+H, ⌘⌥F). Ctrl+Shift+H stays History’s.