Removed input value re-appears in template defined text field

[nikku]

Describe the Bug

As a user, when removing the input of a required field it is actually not removed (it is invalid and this not persisted). Instead it re-appears when I re-select the element:

Steps to Reproduce

• Model a template task A with a required text binding
• Input text FOO => validation error disappears
• Remove text => validation error appears
• Focus another element, and focus A again
• You see that A has FOO as an input text again

Expected Behavior

I'd expect the value to actually be removed, similar to how we handle most errors nowadays.

Environment

• Host (Browser/Node version), if applicable: Any
• OS: Linux (Any)
• Library version: v1.0.0

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Initially reported as connectors feedback via this channel

[nikku]

Intuitively for me this is a case for linting (and our lighter version of validation).

CC @andreasgeier

[nikku]

@christian-konrad Could you have a look into this, understand and assess it?