9660: hide keyword suggestions in non trivial paths r=Veykril a=Freax13 This pr hides keyword suggestions in non trivial paths: ![now](https://user-images.githubusercontent.com/14952658/126479635-819127d8-322b-4e34-acd2-194d1e9ba504.png) Previously rust analyzer suggested a lot of keywords even when completing non trivial paths: ![prev](https://user-images.githubusercontent.com/14952658/126478222-54c742bb-2bd3-4e5b-b533-f835264604be.png) This had 2 problems: 1. Suggesting a keyword in this position doesn't make sense. 2. There are a lot of keywords, so they make it a lot harder to find the things you're actually looking for (note the scrollbar and that `instructions`, `registers` and `structures` are not visible). Co-authored-by: Tom Dohrmann <erbse.13@gmx.de>
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