Well, I've updated support libs to 25 ver. and noticed that autocomplete in axml layouts is still broken.
VS autogenerates .xsd files in "obj\Debug\Schemas\2*" you know. But 'schemas.android.com.apk.res.android' for 25 api is too large: 6MB (for api 23 it was about 100kb).
If I force VS to use 23-24 schemas, autocomplete works fine, but VS replaces it with 25 schema again after another .axml (source/designer) is opened.
Any idea how to fix?