In mat-select, make the multiple value separator configurable

[karlgoldstein]

Please describe the feature you would like to request.

The mat-select is currently hard-coded to use a comma as the delimiter for displaying multiple values:

components/src/material/select/select.ts

Line 687 in 058ed0f

return selectedOptions.join(', ');

Please add a configurable property for the delimiter.

What is the use-case or motivation for this proposal?

Localization, as well as semantics, i.e. ability to use AND or OR as the separator.

Is there anything else we should know?

Nope.

[Airblader]

Not sure this is still needed, there is already a way to customize the trigger value: https://material.angular.io/components/select/overview#customizing-the-trigger-label

[karlgoldstein]

@Airblader I missed that, it is even better than delimiter configuration. Agreed that the delimiter is not necessary. Thanks!

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