DataTable auto-width columns don't shrink back down

[rodrigogiraoserrao]

Removing rows won't recompute the width of auto-width columns.

To reproduce, run the app below and press R

Repro app

from textual.app import App, ComposeResult
from textual.widgets import DataTable

ROWS = [
    ("lane", "swimmer", "country", "time"),
    (4, "Joseph Schooling", "Singapore", 50.39),
    (2, "Michael Phelps", "United States", 51.14),
    (5, "Chad le Clos", "South Africa", 51.14),
    (6, "László Cseh", "Hungary", 51.14),
    (3, "Li Zhuhao", "China", 51.26),
    (8, "Mehdy Metella", "France", 51.58),
    (7, "Tom Shields", "United States", 51.73),
    (1, "Aleksandr Sadovnikov =============", "Russia", 51.84),
]


class TableApp(App):
    def compose(self) -> ComposeResult:
        yield DataTable()

    def on_mount(self) -> None:
        table = self.query_one(DataTable)
        table.add_columns(*ROWS[0])
        *_, self.last_row = table.add_rows(ROWS[1:])

    def key_r(self):
        self.query_one(DataTable).remove_row(self.last_row)


app = TableApp()
if __name__ == "__main__":
    app.run()

[TomJGooding]

It looks like currently the column widths are only updated based on _new_rows or _updated_cells. Obviously if you're only deleting rows, these will both be empty.