[FormGroup] Using both inline and subLabel props produce misaligned subLabels

[saruman1234]

Environment

• Package version(s): @blueprintjs/core 4.3.0

Steps to reproduce

1. Use a FormGroup with both inline and subLabel props.

<FormGroup
    inline={true}
    label="Label"
    labelFor="text-input"
    labelInfo="(required)"
    subLabel="Label helper text with details..."
>
    <InputGroup id="text-input" placeholder="Placeholder text" />
</FormGroup>

Actual behavior

Screenshot from the docs example page:

Expected behavior

The subLabel appears aligned with something, so either:

• The subLabel appears below the label/labelInfo?
• The subLabel appears above the input?