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"""Regression test for #1616 https://github.com/Textualize/textual/issues/1616"""
from textual.app import App
from textual.containers import VerticalScroll
async def test_overflow_change_updates_virtual_size_appropriately():
class MyApp(App):
def compose(self):
yield VerticalScroll()
app = MyApp()
async with app.run_test() as pilot:
vertical = app.query_one(VerticalScroll)
height = vertical.virtual_size.height
vertical.styles.overflow_x = "scroll"
await pilot.pause() # Let changes propagate.
assert vertical.virtual_size.height < height
vertical.styles.overflow_x = "hidden"
await pilot.pause()
assert vertical.virtual_size.height == height
width = vertical.virtual_size.width
vertical.styles.overflow_y = "scroll"
await pilot.pause()
assert vertical.virtual_size.width < width
vertical.styles.overflow_y = "hidden"
await pilot.pause()
assert vertical.virtual_size.width == width
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