Incorrect autocompletion

• VSCode Version: 1.23.1
• VSCode-R Version: 0.59
• OS Version: OSX 10.12.6

Steps to Reproduce:

1. type first few words of (say "as.")
2. tab complete and select entry (e.g, "as.array")
3. completion doubles word typed in (1), i.e., "as.as.array"
   [see screenshots]

[renkun-ken]

Any symbol that contains . will cause problem like this. It seems that the syntax specification does not correctly handle dots in symbols.

[randy3k]

It seems to be related to the wordPattern settings in language configuration.

[Ikuyadeu]

@stegmueller Thank you for issue.
@randy3k @randy3k Thank you for information.
Now, fixed.