bug(material/tree): node added with insertNode remains visible after dataSource is updated
- Dominant language
- TypeScript
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Description
### 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
I'm using Material Tree and `insertNode` method to create a node inside the tree menu.
### Reproduction
[StackBlitz link]( https://stackblitz.com/edit/eksxnj-u1duzq?file=src%2Fexample%2Ftree-dynamic-example.html)
Steps to reproduce:
1. Open the app and focus inside the document
2. Press `a` to add a new node using `insertNode` method
3. Press `r` to restore the data to the initial state.
### Expected Behavior
I expect that when the `data` object is populated, only the nodes passed in this array should be on the interface.
### Actual Behavior
A ghost node is added.
### Environment
```sh
@angular-devkit/architect 0.1703.7
@angular-devkit/build-angular 17.3.7
@angular-devkit/core 17.3.7
@angular-devkit/schematics 17.3.7
@angular/cli 17.3.7
@schematics/angular 17.3.7
ng-packagr 17.3.0
rxjs 7.8.1
typescript 5.4.5
webpack 5.90.3
zone.js 0.14.5
```
This is also in v18.
Contributor guide
Research direction
Start with the linked StackBlitz reproduction at src/example/tree-dynamic-example.html and reproduce the sequence: press `a` to call insertNode, then `r` to restore the initial data. Trace how the Material Tree handles the data update after insertion; done means only the nodes in the restored data array remain visible, with no ghost node.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- angular, typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100