Dialogs lack a good way of disabling mouse support

While prompts provide a simple way of disabling mouse support (e.g. prompt('What is your name: ', mouse_support=True)), there is no similar way of doing this for dialogs with the default wrapper functions (e.g. yes_no_dialog(title='foo', text='bar', mouse_support=False).

Instead, it seems to be necessary to create a Dialog object manually, construct an Application object, and then pass the flag on that.

def _create_prompt_app(dialog, style):
    # Key bindings.
    bindings = KeyBindings()
    bindings.add('tab')(focus_next)
    bindings.add('s-tab')(focus_previous)

    return Application(
        layout=Layout(dialog),
        key_bindings=merge_key_bindings([
            load_key_bindings(),
            bindings,
        ]),
        mouse_support=False,
        style=style,
        full_screen=True)

If mouse support is enabled, selection / copy & paste breaks in MacOS with Terminal and iTerm

The appropriate fix would be to be able to specify mouse_support=False for the wrapper methods shipped with python-prompt-toolkit.

Start by tracing the default dialog wrapper functions, such as yes_no_dialog, to the Dialog and Application construction shown in the issue. Add a mouse_support option to those wrappers and verify that passing False reaches the Application; done means callers can disable mouse support without constructing Dialog and Application objects manually.