AlignmentControlMatrix display doesn't respect the `width` prop.

[ryanwelcher]

Description

While updating the documentation for the AlignmentControlMatrix, I found that no matter what value I passed to the width prop, the display was always the same.

Step-by-step reproduction instructions

1. Add the code snippet to a plugin
2. Change the width value to anything other than the default of 92
3. The widget of the component is unchanged

Screenshots, screen recording, code snippet

I created a simple plugin with the following code to render the control:

import { __experimentalAlignmentMatrixControl as AlignmentMatrixControl } from '@wordpress/components';
import { useState } from '@wordpress/element';
import { registerPlugin } from '@wordpress/plugins';
import { PluginDocumentSettingPanel } from '@wordpress/edit-post';

const Example = () => {
    const [ alignment, setAlignment ] = useState( 'center center' );
    return (
        <PluginDocumentSettingPanel title="test">
            <AlignmentMatrixControl
                width="2000"
                value={ alignment }
                onChange={ ( newAlignment ) => setAlignment( newAlignment ) }
            />
        </PluginDocumentSettingPanel>
    );
};

registerPlugin( 'my-plugin', { render: Example } );

As you can see in the screenshot, the value is passed to the markup but the default value ( 92 ) is overriding the styles.

Environment info

• Wordpress 5.8 using a default theme.

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[ryanwelcher]

Discovered while working on #34662

[ajskelton]

@ryanwelcher While testing out the AlignmentControlMatrix today I came across this old open issue. However it appears to be fixed now as setting the width attribute does control the width of the component.

Here is a playground with a block using the AlignmentControlMatrix component and the width is set to 248 (the max width of the sidebar when inside a PanelBody). AlignmentMatrixTest Playground

That playground is loading this plugin that has a simple block using the AlignmentMatrixControl: Plugin Block with width attribute set