Wizard with branching (conditional) pages broken between 5.0.2 and 5.1.0/5.2.5

[GMacAussie]

Describe the bug
It seems a change in 5.1.0 broke wizard pages that branch - AKA have conditional page visibility. Edit: I was wrong with the Wizard.js validateCurrentPage() supposition - see comment below.

Version/Branch
5.0.2 works
5.1.0+ fails

To Reproduce
StackBlitz here https://stackblitz.com/edit/js-k2gjhlzu.

Expected behavior
The conditional page handling correctly resets data from hidden wizard pages so that page navigation is correct.

Screenshots
See StackBlitz.

Additional context
Our forms were created with 4.14.0 where wizard branching worked correctly. Upgrading to 5.2.5 results in aberrant behaviour.

Version 5.0.2 has correct behaviour.

[GMacAussie]

It appears the breaking change was between 5.1.0-rc.27 and 5.1.0-rc.28. Specifically the change in Component.js clearComponentOnHide() on line 2540 -> 2594 here:

v5.1.0-rc.27...v5.1.0-rc.28

Restoring the if (this.conditionallyHidden()) from if (this.shouldConditionallyClear()) corrects the behaviour, as the shouldConditionallyClear() does far more checking that the original conditionallyHidden().

Since I am pretty new at this codeline I won't attempt to make this fix.

[GMacAussie]

Along with this problem, another issue was introduced between 5.1.0-rc.25 and 5.1.0-rc.26. In this case, the shouldAddDefaultValue() gettor added a pristine check.

This means that if the user:

1. Starts on Page 1
2. Selects to go to Page 2;
3. Unselects a defaulted field which allows continuation to Page 3;
4. Backtracks Page 1;
5. Selects to go to Page 4;
6. Backtracks Page 1;
7. Selects to go to Page 2;
8. -> The default field is NOT restored (no longer pristine field), therefore no continuation to Page 3 until it is selected.

For our usage, this is incorrect - defaults should be restored when conditional pages are restored, and this was the behaviour from 4.14.0 -> 5.1.0-rc.25