Autocomplete should not escape colon without white-space following

[donorp]

Is your enhancement related to a problem? Please describe.

Introduced in #475 as the fix of #474 : property name with colon gets escaped.

But when the key is in part-a:part-b or :part-b format, there is no white-sapce following the colon, the colon is not indicating a map, we should not escape the key, as that's just plain yaml string.

Describe the solution you would like

Do not escape keys in part-a:part-b or :part-b format.

Describe alternatives you have considered

None.

Additional context

Further more, yaml accepts arbitrary map key, the key can be a map or an array:

{k1: v1, k2: v2}: v3
[v1, v2]: v3

probably that should not be considered for now.

[evidolob]

Resolved with #572