Field value suggestion in query input are only being displayed when field name is at the end of a query

[linuspahl]

Description

Every time when writing a field name like http_method:, the field value suggestion should be displayed. This is not the case, when the field name is not at the end of the query. For example in this case:

Your Environment

• Graylog Version: 5.2 (works a s expected with 5.1)