fix: build render.php when webpack watch in progress

[Takshil-Kunadia]

PR For :- Issue #49790

What?

• render.php isn't created in the build when created in block's src.
• See @wordpress/scripts doesn't detect render PHP files without a restart #49790 for more details.

Why?

• Based on these findings by @gziolo
• Webpack's CopyWebpackPlugin is watching changes in the files. But it doesn't create render.php in the build folder, when the developer adds it in a src folder of a block. This PR Fixes the problem.

How?

• renderPaths which is utilized to watch over all the render file paths, was not getting recalculated again during the watching process.
• The patch adds code to the webpack.config.js in order to recalculate the paths whenever a **/*.php file's pattern is hit in the CopyWebPack Plugin of Webpack.

let renderPaths = getRenderPropPaths();
// CopyWebPack Plugin's Pattern
{
	from: '**/*.php',
	context: getWordPressSrcDirectory(),
	noErrorOnMissing: true,
	filter: ( filepath ) => {
		renderPaths = getRenderPropPaths(); 	// Recalculate Render Pro Paths
		return (
			process.env.WP_COPY_PHP_FILES_TO_DIST ||
			renderPaths.includes( filepath )
		);
	},
},

Testing Instructions

1. Create a Dynamic Block, and don't add render.php file.
2. Run the build/watch script, observe the build folder to see it reflect the src folder.
3. Add render.php to render attribute of block.json of the Block.
4. Create a render.php and see it doesn't get generated in the build folder of the Block.
5. After Patch, It will get generated, when you add the render.php to src folder.

[github-actions]

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[gziolo]

I can confirm that it resolves the issue.

[gziolo]

Thank you for the fix. I'll explore in the follow-up whether we can run the computation only once per change detected by webpack in watch mode.

[github-actions]

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