Clear dialog by C-c

Author: aycabta

lib/reline/line_editor.rb

@@ -151,6 +151,7 @@ def reset(prompt = '', encoding:)
     @screen_height = @screen_size.first
     reset_variables(prompt, encoding: encoding)
     @old_trap = Signal.trap(:INT) {
+      clear_dialog
       if @scroll_partial_screen
         move_cursor_down(@screen_height - (@line_index - @scroll_partial_screen) - 1)
       else