Attempting to fix code completion after new HashMap<>

[lahodaj]

Consider code like:

Map<Object, Object> m = new HashMap<>//code completion here

In VS Code, selecting e.g. the HashMap() option will repeat HashMap here. Inside the NetBeans UI, this will not happen, but <tab> will still insert HashMap.

This is an attempt to avoid these problems, by recording the completion appeared after the <>, and not inserting the name. Not sure if this is the best solution, though.

[mbien]

quickly checked for regressions since the last completion chaining fix #4165 and everything appeared to still work fine

[dbalek]

Looks fine. Thanks.