fix(material/form-field): enhance error handling for multiple form field controls

[mistrykaran91]

Currently, when multiple mat form fields are used together, the error is taken for the first control only, this take into consideration other controls too if they exist

Fixes #28887

[crisbeto]

The form field isn't meant to have more than one control.

[mistrykaran91]

The form field isn't meant to have more than one control.

Normally, we have matInput and mat-chip-grid or mat-autocomplete and mat-chip-grid together so won't that be considered as more than one control ? Or is this issue not valid ?

[crisbeto]

matInput isn't really necessary for mat-chip-grid. As for the autocomplete scenario, it has always been a bit under-developed since what ends up happening is that the form field takes whichever control was defined first. Either way, we shouldn't try to account for multiple controls, because then it becomes tricky to reconcile things like the current label and value.

[mistrykaran91]

matInput isn't really necessary for mat-chip-grid. As for the autocomplete scenario, it has always been a bit under-developed since what ends up happening is that the form field takes whichever control was defined first. Either way, we shouldn't try to account for multiple controls, because then it becomes tricky to reconcile things like the current label and value.

Ok got you, then I think we should close or reject the current issue which associated with it ?