bug(mat-select): Panel `null` on `openedChange`

[angelaki]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

19.1

Description

With the old version this code used to work / the panel never was null:

@ViewChild(MatSelect) matSelect: MatSelect;

ngAfterViewInit(): void {
    this.matSelect.openedChange.subscribe(opened => {
        if (opened) {
            console.log(this.matSelect.panel);
            setTimeout(() => console.log(this.matSelect.panel), 0);
        }
    });
}

Since 19.2 the panel is null until the timeout occurs. I've noticed this behavior using ng-mat-select-infinite-scroll (HaidarZ/ng-mat-select-infinite-scroll#57).

Reproduction

Code provided above.

Expected Behavior

panel should never be empty if openedChange is called.

Actual Behavior

panel is null.

Environment

Angular CLI: 19.2.1
Node: 22.11.0
Package Manager: pnpm 10.5.2
OS: win32 x64

Angular: 19.2.1
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
... service-worker

Package Version

@angular-devkit/architect 0.1902.1 (cli-only)
@angular-devkit/build-angular 19.2.1
@angular-devkit/core 19.2.1 (cli-only)
@angular-devkit/schematics 19.2.1 (cli-only)
@angular/cdk 19.2.2
@angular/material 19.2.2
@angular/material-luxon-adapter 19.2.2
@schematics/angular 19.2.1 (cli-only)
rxjs 7.8.2
typescript 5.8.2
zone.js 0.15.0

[crisbeto]

The behavior changed in 19.2 in that openedChange emits immediately instead of after the animation. You may have to add a delay before reading it to ensure it's there. I'm closing the issue, because the panel is an implementation detail of the select.

[angelaki]

Ok, so works as intended - thank you :)

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