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When this library is used in SSR react app, `window is not defined` error comes up.
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### Describe the project you are working on
I am working on a dynamic shader based roof cutting system for my levels that exposes the interiors of buildings,caves,etc...
This is an old gif showing h…
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**What you were expecting:**
When using the arrow key to navigate on NestedMenuItem-List the popup menu close upon changing to the next NestedMenuItem and a new menu popup open.
**What happened in…
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### Duplicates
- [X] I have searched the existing issues
### Latest version
- [X] I have tested the latest version
### Steps to reproduce 🕹
Link to live example:
Steps:
I added D…
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After an update of the package react-scripts from version 3.0.1 to 5.0.0, I receive the next 2 warnings:
(node:23640) [DEP_WEBPACK_DEV_SERVER_ON_AFTER_SETUP_MIDDLEWARE] DeprecationWarning: 'onAfterSe…
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**Current behavior:**
I'm using emotion with Next.js.
If I use a `:first-child` selector, I see the error in dev tools:
> The pseudo class ":first-child" is potentially unsafe when doing serve…
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### Duplicates
- [X] I have searched the existing issues
### Latest version
- [X] I have tested the latest version
### Steps to reproduce 🕹
Link to live example:
Steps:
1.
2.
3.
### Curr…
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- [x] The issue is present in the latest release (and the v5 beta).
- [x] I have searched the [issues](https://github.com/mui-org/material-ui/issues) of this repository and believe that t…
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Something like this:
![Footer](https://imgur.com/OalmAZa.png)
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Material UI Select component is lagging when having more than 200 options. I try to work around it using `react-virtual` npm. this should solve the issue because it follows the Select rule of children…