Hook kern table to shaper

[behdad]

Hook kern table to shaper itself, so it works for all font funcs.

[KrasnayaPloshchad]

In TDF Bugzilla there is a request to get support for kern table recently, which have been proved affecting MS core fonts released from SF.net, so leave this bug to track.
https://bugs.documentfoundation.org/show_bug.cgi?id=105992

[behdad]

I'm guessing that that's a different issue: we ignore kern table if GPOS is present... Some versions of those fonts have both and rely on kern being applied. @khaledhosny is that what's that issue is about? Or your font funcs impl doesn't have kern wired up? At any rate, I don't mind fixing both.

[khaledhosny]

I switched to using ot font function in LibreOffice, so that is about their lack of kern table support.

[KrasnayaPloshchad]

Since LibreOffice using HarfBuzz for text layout, this bug should be fixed based on native support provided by HB.

[khaledhosny]

Already fixed.

[behdad]

I like to hook kern table to shaper itself, so it works for all font funcs. I think there's another issue for that.

[khaledhosny]

We don’t seem to have an issue for this, re-opening and changing the description.