angular / angular/components

bug(material/chips): MatChipSelectionChange not emitting on certain deselections

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area: material/chips P3
主要语言
TypeScript
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描述

### 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

_No response_

### Description

`selectionChange` output for `MatChipOption` is [stated to be](https://material.angular.io/components/chips/api#MatChipOption):
> Emitted when the chip is selected or **deselected**.

But this is not true for deselection. It appears the event is only emitted for deselection when **the chip in question** is manually selected/toggled by the user. When the `MatChipListbox` is **in single-select mode and a chip is currently selected**, selecting a different chip means the prior chip is deselected --> deselecting should mean emitting the `selectionChange` event, but it is not happening in this scenario.

See the below StackBlitz link.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/firqg1
Steps to reproduce:

(First chip is initially selected)
1. Click on the Second chip.
2. First chip becomes deselected, but no `selectionChange` output event was emitted (in this case, the `MatChipSelectionChange` object should be logged to the console).

### Expected Behavior

`selectionChange` output for the First chip should have emitted.

### Actual Behavior

`selectionChange` output for the First chip does not emit.

### Environment

- Angular: 16
- CDK/Material: 16.2.7 (latest)
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

贡献指南

打开贡献指南

调研方向

打开链接的 StackBlitz 复现,并检查 issue 中描述的 MatChipOption 和 MatChipListbox 选择行为。验证选择第二个 chip 时的 single-select 取消选择路径;当第一个 chip 被取消选择时发出其 MatChipSelectionChange 事件,即表示完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
angular, typescript
领域
frontend
Issue 类型
缺陷
难度
3/5
预计耗时
1-2 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
45/100

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