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test failure #15

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andrewseguin
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HeadlessChrome 83.0.4103 (Mac OS X 10.15.6) MatSelect with placeholder in ngcontainer with ngIf should set the select value FAILED
	Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value for 'attr.aria-labelledby': ' mat-select-value-1'. Current value: 'mat-form-field-label-1 mat-select-value-1'.
	    at throwErrorIfNoChangesMode (packages/core/src/render3/errors.ts:59:9 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:5802:15)
	    at bindingUpdated (packages/core/src/render3/bindings.ts:62:9 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:13683:21)
	    at ɵɵattribute (packages/core/src/render3/instructions/attribute.ts:33:7 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:13734:13)
	    at MatSelect_HostBindings (src/material/select/select.js:1183:199)
	    at setHostBindingsByExecutingExpandoInstructions (packages/core/src/render3/instructions/shared.ts:109:13 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:7556:29)
	    at refreshView (packages/core/src/render3/instructions/shared.ts:469:5 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:7846:13)
	    at refreshEmbeddedViews (packages/core/src/render3/instructions/shared.ts:1643:9 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:8894:21)
	    at refreshView (packages/core/src/render3/instructions/shared.ts:444:5 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:7824:13)
	    at refreshComponent (packages/core/src/render3/instructions/shared.ts:1693:7 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:8940:17)
	    at refreshChildComponents (packages/core/src/render3/instructions/shared.ts:147:5 <- npm/node_modules/@angular/core/__ivy_ngcc__/bundles/core.umd.js:7593:13)

crisbeto and others added 2 commits August 12, 2020 17:34
Applies some of our recent learnings on how to handle the accessibility of a custom select to `mat-select`. Includes switching the trigger to be a `combobox` and the panel to a `listbox`.

Fixes angular#11083.
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