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Issue number: resolves #30552 --------- <!-- 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. --> Something caused a timing shift in v8.6.0 that messed up the timing required for react router to set the active tab ID. Currently, when the router goes to set the tab ID, it's possibly too early and the tab may not exist yet, causing it to go unset. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> This PR is a workaround that allows tabs to check when they're rendered if a tab should be selected as a fallback for the router not setting them. I don't think the tabs, in the long run, should be responsible for this, but I think this is a good intermediate step until the upcoming react router upgrade, when we can look into a better solution for react router that may require less timing precision. This PR also adds regression tests for React to make sure this doesn't happen again without getting noticed. ## Does this introduce a breaking change? - [ ] Yes - [X] No <!-- If this introduces a breaking change: 1. Describe the impact and migration path for existing applications below. 2. Update the BREAKING.md file with the breaking change. 3. Add "BREAKING CHANGE: [...]" to the commit description when merging. See https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#footer for more information. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> **Current dev build:** ``` 8.7.2-dev.11754338216.1a548096 ```
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