Calc width including escape sequences and padding with spaces correctly

Author: aycabta

lib/reline/line_editor.rb

@@ -651,7 +651,9 @@ def add_dialog_proc(name, p, context = nil)
           bg_color = '46'
         end
       end
-      @output.write "\e[#{bg_color}m%-#{dialog.width}s\e[49m" % Reline::Unicode.take_range(item, 0, dialog.width)
+      str = Reline::Unicode.take_range(item, 0, dialog.width)
+      str += ' ' * (dialog.width - calculate_width(str, true))
+      @output.write "\e[#{bg_color}m#{str}\e[49m"
       Reline::IOGate.move_cursor_column(dialog.column)
       move_cursor_down(1) if i < (dialog.contents.size - 1)
     end