[MatSelect] Order in multiple mode

[Howard-Song]

Bug, feature request, or proposal:

feature

What is the expected behavior?

Using MatSelect with multiple selection,(selectionChange) will give the result which sort by user selected order.

What is the current behavior?

When using MatSelect with multiple selection,(selectionChange) will give the result which sort by selected options order.I think this order should defined by developer,such as sort by user select or default options order.

What are the steps to reproduce?

Providing a StackBlitz reproduction is the best way to share your issue.

StackBlitz starter: https://goo.gl/wwnhMV

What is the use-case or motivation for changing an existing behavior?

Make select value sort rules defined by developer.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular: 6.0.0,
Material: 6.0.1,
OS: win10,
TypeScript: 2.7.2,
Browsers: Chrome@67.0.3396.87

Is there anything else we should know?

[crisbeto]

You should be able to sort the values yourself when you get it in the selection change event.

[Howard-Song]

@crisbeto Yes, I have fixed by this way.But in <mat-selcect #select></mat-select> , It's only way to overwrite the text by select._elementRef.nativeElement.firstChild.firstChild.children[0].innerText = 'b,a,c'. In fact, I'm already finish this case,just give some advice for better component.

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