feat(Material Select) - Displaying Custom Trigger when no option is selected

[omkarshinge]

Displaying Custom Trigger when no option is selected

The feature to let user display Custom trigger when user has not selected any element ( We can have a property which will let us to show the custom trigger even when no option is selected )

Use Case : While implementing multiple select filter using Material Select component, we can use <mat-select-trigger> for creating custom trigger as per the specs one need.

We had a use case where we were required to create search based multi select filter. While searching through the elements using the input box provided the options get populated dynamically as per user entered string. When user searches using the input box and if no option in the options populated are selected then the custom trigger we had gets hidden (It doesn't display). This may lead the user of such filter in consistent state as to what all values are selected previously as the trigger gets hidden

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