[8.x] do not set full screen mode on ExitFullScreenButton re-render (#198012) #198059
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…c#198012) ### Background elastic#194892 is refactoring [DashboardRenderer](https://github.com/elastic/kibana/blob/3391344e8dc8377d359b918521b6c48838cde8ae/src/plugins/dashboard/public/dashboard_container/external_api/dashboard_renderer.tsx) component to replace Dashboard Embeddable with a plain old javascript object. Dashboard Embeddable rendered its contents in a new react tree. The new implementation does not. Since the new implementation does not render the dashboard in a new react tree, any re-render in `DashboardViewport` parent components causes `ExitFullScreenButton` to re-render. In its current form, re-rendering `ExitFullScreenButton` calls `onExit`, which causing dashboard to exit full screen mode. This PR makes use of `useCallback` to fix the issue where re-rending `ExitFullScreenButton` calls `onExit`. ### Test steps 1) Open dashboard that ships with sample web logs data set 2) switch to view mode 3) click "Full screen" button 4) Maximize a panel. Verify dashboard stays in full screen mode. (cherry picked from commit 9e9a6bb)
![github-actions[bot]](https://avatars.githubusercontent.com/in/15368?s=60&v=4){kind=small}
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