ScrollView autoscroll

[n-doerrer]

I am trying to implement a LogViewer.
New log entries are added via a method call, adding text to a panel which is inside a scrollview - in the example below initiated by a keystroke.
After adding a line, I retrieve the current virtual size of the ScrollView and use that to scroll to the maximum.
That kind of works, but seems to always lack behind for 1-2 lines. I guess I'm missing a call to wait for properly set size on the Widget or its layout. Does anyone have an idea what is missing?

from textual.app import App
from textual.reactive import Reactive
from textual.widget import Widget
from textual.widgets import ScrollView
from rich.panel import Panel

class LogPanel(Widget):
	logs = Reactive([])

	def write(self, message: str) -> None:
		self.logs.append(message)
		self.refresh(layout=True)

	def render(self) -> Panel:
		return Panel("\n".join(self.logs), title="Logs")

class LogView(ScrollView):
	def __init__(self) -> None:
		self.log_panel = LogPanel()
		super().__init__(self.log_panel)

	async def write(self, message: str) -> None:
		self.app.log("log_panel size before adding:" + str(self.log_panel.size))
		self.log_panel.write(message)
		await self.update(self.log_panel)
		await self.refresh_layout()  # I thought this should set the new size
		self.app.log("log_panel size after adding:" + str(self.log_panel.size))
		self.scroll_in_to_view(self.window.virtual_size.height)

class MyApp(App):
	log_view = None

	async def on_mount(self) -> None:
		self.log_view = LogView()  # LogPanel()  # using LogPanel here obviously doesnt scroll
		await self.view.dock(self.log_view, size=5)

	async def on_key(self):
		await self.log_view.write("test")

MyApp.run(title="test", log="textual.log")

There are App.log calls noting the size of the Widget before and after adding the new line. But they are always identical (increasing at some point between two calls of LogView.write).

[n-doerrer]

While i did not find the cause of this behaviour, or a solution within textual 0.1, this does work properly with the TextLog widget introduced in textual 0.2.