Creating and maintaining evenly-spaced columns on full-application

is it possible to create a [vertically] evenly-spaced layout, which stays evenly spaced, even when dynamically changing content of window children?

Below is some sample code. Pressing c injects some content into the two windows' FormattedTextControl's, relative width changes (vertical divider moved with each press..). Columns are not evenly spaced even on initialization on narrow terminal when user_msg instructions are initially displayed (namely, application doesn't even start evenly spaced on a narrow terminal).

from random import randint

from prompt_toolkit.application import Application
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.layout.containers import VSplit, Window
from prompt_toolkit.layout.controls import FormattedTextControl
from prompt_toolkit.layout.dimension import D
from prompt_toolkit.layout.layout import Layout

user_msg = "press 'c' to change, 'q' to quit"

body = VSplit(
    [
        Window(
            FormattedTextControl(text=user_msg),
            width=D(weight=1),
            wrap_lines=True,
        ),
        Window(width=1, char="|"),
        Window(FormattedTextControl(), width=D(weight=1), wrap_lines=True),
    ]
)

kb = KeyBindings()


@kb.add("c")
def change_content(event):
    for w in event.app.layout.find_all_windows():
        prev_width = f"prev_width: {w.render_info.window_width}"
        rand_str = "*" * randint(1, 150)
        w.content.text = "\n".join([prev_width, rand_str])


@kb.add("q")
def quit(event):
    event.app.exit()


layout = Layout(body)
app = Application(layout=layout, key_bindings=kb, full_screen=True)
app.run()

Start by running the sample code from the issue and reproducing the divider movement after pressing c, including on a narrow terminal. Then trace the VSplit, Window, and D(weight=1) layout behavior; done means both columns remain evenly spaced after content changes and at initial render.