Using xlink:href in SVG can cause pointless style recalculations about virtual-dom HOT 3 OPEN

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

from virtual-dom.

I believe the reason for this issue is that for all namespaced attributes the value is an object,

which we then try to compare by reference.

This is bound to fail and force a patch every time we do a comparison on namespaced attributes.

It seems like Firefox is kinder when you use setAttributeNS with the old value, while Chrome forces a recalculation and will even try to re-fetch images from the network (see evancz/elm-playground#5 for an example).

from virtual-dom.

Adding a condition like this

 if (xValue === yValue && xKey !== 'value' && xKey !== 'checked' 
 	|| category === 'a__1_EVENT' && _VirtualDom_equalEvents(xValue, yValue)
        || category === 'a__1_ATTR_NS' && xValue.__namespace === yValue.__namespace && xValue.__value === yValue.__value)

to the if-clause in _VirtualDom_diffFacts should solve the problem.

from virtual-dom.