Default value is being cleared out

[MuFa117]

Related:

• Hide default value when user starts typing #717
• Clear default value when input #719

As much as I can agree with idea of hiding the 'default' string once user starts typing, I'm not sure if clearing the option for it then is the right way to go. That provides to data drop.

In the case, that user typed wrong/invalid answer (validation function returned false) another prompt does not have default option anymore. Prompt is being shown until the validation function returns true - which means it should drop data during the revoke.

Sometimes use can click something by accident, or during typing new answer realized that s/he wants to use the default version (but at this point, the default version is already gone).

What do you think?