docking and auto sizing

[TryMyWagon]

child widgets of a parent widget docked to the right side of the screen still try to default to the left and will try to "magnetize" as far left as possible (as far as allowed by the parent widgets max-width: value).

Using auto scaling in the parent widget causes the child widgets snap back to the left and stretch the parent container across the entire view

attempting to align the runaway widget to the right side (via the parent) does not fix the parent containers auto scaling being stretched

This is using the most recent src including the merge made last night (#5360)

test code;

from rich.console import Console
from rich.traceback import install

install()

from rich import pretty

pretty.install()

from textual.app import App
from textual.widgets import Button, Static


# buttons inside the sidebar
class StartButtons(Static):
    def compose(self):
        yield Button("Placeholder", variant="primary", id="p1")
        yield Button("Placeholder", variant="error", id="p2")


# sidebar widget
class Sidebar(Static):
    def compose(self):
        yield StartButtons()


# side container
class SideContainer(Static):
    def compose(self):
        yield Sidebar()


# Main app
class Test4(App):
    DEFAULT_CSS = """
    StartButtons {
        background: yellow;

        align-horizontal: center;
    }
    SideContainer {
        dock: right;

        height: 99%;
        width: 99%;

        background: red;

        # max-width: 60;
        # align-horizontal: right;
    }
    Sidebar {
        min-width: 30;
        height: 20;
        width: 20;

        background: blue;
        border: double green;

    }
    """

    BINDINGS = [
        ("q", "quit", "Quit"),
    ]

    def compose(self):
        yield SideContainer()

    def action_quit(self):
        self.exit()


# run
if __name__ == "__main__":
    Test4().run()

# Textual Diagnostics

## Versions

| Name    | Value  |
|---------|--------|
| Textual | 0.88.1 |
| Rich    | 13.9.4 |

## Python

| Name           | Value                                                                                                            |
|----------------|------------------------------------------------------------------------------------------------------------------|
| Version        | 3.12.1                                                                                                           |
| Implementation | CPython                                                                                                          |
| Compiler       | MSC v.1937 64 bit (AMD64)                                                                                        |
| Executable     | C:\Users\Miles\Documents\!Programs(LOCAL)\!Projects\(python) TwitchOW2PredictionBot\src\.venv\Scripts\python.exe |

## Operating System

| Name    | Value      |
|---------|------------|
| System  | Windows    |
| Release | 10         |
| Version | 10.0.19045 |

## Terminal

| Name                 | Value           |
|----------------------|-----------------|
| Terminal Application | vscode (1.95.3) |
| TERM                 | *Not set*       |
| COLORTERM            | truecolor       |
| FORCE_COLOR          | *Not set*       |
| NO_COLOR             | *Not set*       |

## Rich Console options

| Name           | Value                |
|----------------|----------------------|
| size           | width=204, height=25 |
| legacy_windows | False                |
| min_width      | 1                    |
| max_width      | 204                  |
| is_terminal    | True                 |
| encoding       | utf-8                |
| max_height     | 25                   |
| justify        | None                 |
| overflow       | None                 |
| no_wrap        | False                |
| highlight      | None                 |
| markup         | None                 |
| height         | None                 |

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