Fix multiple subscriptions to same observables on form activation

[alekart]

Fixed an issue where some observables were subscribed multiple times each time the activateForm method is called.

The activateForm method is called in setValues method which is called when the form config is updated causing emitters (onChanges, changeDetector, isValid, validationErrors) to emit at least twice after first form init and the number of emits increases each time the form config is updated.
When config is changed all emitters emit for each input present in the layout, as it was not unsubscribed a new subscription
is created on each iteration...

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[codecov]

Codecov Report

Merging #299 (043e4f6) into main (880d9c2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #299   +/-   ##
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  Coverage   20.97%   20.97%           
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  Files          10       10           
  Lines         906      906           
  Branches      363      363           
=======================================
  Hits          190      190           
  Misses        657      657           
  Partials       59       59           

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[hamzahamidi]

Thanks for help @alekart . I will publish this under 0.6.0-beta.1 if that's ok with you

[alekart]

Thanks for help @alekart . I will publish this under 0.6.0-beta.1 if that's ok with you

Thats OK for me if it's ok for you. I use a personal fork because the project I use for is still in Angular 9, but this fix seems to be a nice performances enhancement.