[file_selector] Update Linux example for deprecations

[stuartmorgan-g]

The file_selector_linux example was using some methods that have been deprecated in favor of param-object versions. This updates to use those new versions.

[flutter-dashboard]

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[stuartmorgan-g]

test-exempt: code refactor with no semantic change

[gemini-code-assist]

Code Review

This pull request updates two example files in file_selector_linux to replace deprecated method calls (getDirectoryPath and getDirectoryPaths) with their ...WithOptions counterparts (getDirectoryPathWithOptions and getDirectoryPathsWithOptions). My review includes suggestions to improve code conciseness by inlining a constant in both modified files, in line with Dart's style guide.

[gemini-code-assist]

For conciseness, you can inline the confirmButtonText constant directly into the FileDialogOptions constructor. This avoids creating a local variable that is only used once, which is a general recommendation in the Dart style guide.¹

Suggested change

	const confirmButtonText = 'Choose';
	final String? directoryPath = await FileSelectorPlatform.instance
	.getDirectoryPath(confirmButtonText: confirmButtonText);
	.getDirectoryPathWithOptions(
	const FileDialogOptions(confirmButtonText: confirmButtonText),
	);
	final String? directoryPath = await FileSelectorPlatform.instance
	.getDirectoryPathWithOptions(
	const FileDialogOptions(confirmButtonText: 'Choose'),
	);

Style Guide References

Footnotes

1. The repository style guide states that code should follow the relevant style guides for each language. For Dart, this includes following 'Effective Dart' guidelines, which recommend avoiding local variables that are used only once. ↩

[gemini-code-assist]

For conciseness, you can inline the confirmButtonText constant directly into the FileDialogOptions constructor. This avoids creating a local variable that is only used once, which is a general recommendation in the Dart style guide.¹

Suggested change

	const confirmButtonText = 'Choose';
	final List<String> directoryPaths = await FileSelectorPlatform.instance
	.getDirectoryPaths(confirmButtonText: confirmButtonText);
	.getDirectoryPathsWithOptions(
	const FileDialogOptions(confirmButtonText: confirmButtonText),
	);
	final List<String> directoryPaths = await FileSelectorPlatform.instance
	.getDirectoryPathsWithOptions(
	const FileDialogOptions(confirmButtonText: 'Choose'),
	);

Style Guide References

Footnotes

1. The repository style guide states that code should follow the relevant style guides for each language. For Dart, this includes following 'Effective Dart' guidelines, which recommend avoiding local variables that are used only once. ↩