Item13591: add support for IsHidden property

The IsHidden property on a resource is used by various vendors to flag hidden files (in the sense of dot files under unix). Adding a ="IsHidden" property to the response will provide a hit to those file browsers to hide certain directories, such as those that don't have an attachment in them.

• Dophin (kde) does not request it as it uses the dot prefix to a filename instead following good ol' unix habbits
• Libre-Office does request {http://ucb.openoffice.org/dav/props/}IsHidden and a couple more

So it seems sensible to test for /^{.*}IsHidden$/i. This will actually fix an issue where {HideEmptyAttachmentDirs} is set however those resource still being displayed (not hidden).

-- MichaelDaum - 31 Jul 2015

I'd like to see a comment in the code please:

# ishidden handling is based on the usage in namespace http://ucb.openoffice.org/dav/props/, but is assumed to be used consistently in all other namespaces

Apart from that, I'm fine with it.

-- CrawfordCurrie - 31 Jul 2015

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