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Issue number: Internal --------- <!-- Please refer to our contributing documentation for any questions on submitting a pull request, or let us know here if you need any help: https://ionicframework.com/docs/building/contributing --> <!-- Some docs updates need to be made in the `ionic-docs` repo, in a separate PR. See https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#modifying-documentation for details. --> <!-- Please do not submit updates to dependencies unless it fixes an issue. --> <!-- Please try to limit your pull request to one type (bugfix, feature, etc). Submit multiple pull requests if needed. --> ## What is the current behavior? <!-- Please describe the current behavior that you are modifying. --> The counter for incrementing the `id` and `z-index` of an overlay is incremented whenever the `connectedCallback` is fired for an overlay. When an overlay is presented and/or conditionally rendered, the overlay `id` can increment by `n+2` instead of `n+1`. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> - Increments all overlay ids consistently - Removes legacy `ion-modal-{id}` and `ion-popover-{id}` logic - Adds unit tests for the id behavior - Tests are split up into separate files so that the counter is always starting from `0` - Adds an integration test with the Angular test app to verify conditional rendering behavior ## Does this introduce a breaking change? - [ ] Yes - [x] No <!-- If this introduces a breaking change, please describe the impact and migration path for existing applications below. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. -->