AbstractEditorInlineRenameService.SymbolRenameInfo.CanRenameAttributePrefix has buggy implementation

[mavasani]

See c54743b#diff-18aee645fd759fd2e86ce36bfe560751R98

Method has many unused parameters and last line always returns true:

roslyn/src/EditorFeatures/Core.Wpf/InlineRename/AbstractEditorInlineRenameService.SymbolRenameInfo.cs

Lines 86 to 101 in e5a8db4

	private bool CanRenameAttributePrefix(Document document, TextSpan triggerSpan, string triggerText, CancellationToken cancellationToken)
	{
	// if this isn't an attribute, or it doesn't have the 'Attribute' suffix, then clearly
	// we can't rename just the attribute prefix.
	if (!this.IsRenamingAttributeTypeWithAttributeSuffix())
	{
	return false;
	}
	// Ok, the symbol is good. Now, make sure that the trigger text starts with the prefix
	// of the attribute. If it does, then we can rename just the attribute prefix (otherwise
	// we need to rename the entire attribute).
	var nameWithoutAttribute = GetWithoutAttributeSuffix(this.RenameSymbol.Name);
	return triggerText.StartsWith(triggerText); // TODO: Always true? What was it supposed to do?
	}