BarRight / Left / Center and Context Provider

[Crash--]

In a few applications, at least for Drive, we have to do stuff like this :

import BarContextProvider from 'cozy-ui/transpiled/react/BarContextProvider'
{isMobile ? (
        <BarRight>
          <BarContextProvider client={client} t={t} store={client.store}>
            {MoreMenu}
          </BarContextProvider>
        </BarRight>
)

As mentioned by @ptbrowne here (https://github.com/cozy/cozy-drive/pull/2003/files#r414522850) it could be great if those components handle the context by itself.

Is there any use of the cozy-bar without using the context of the requesting App? Or do we have to pass every time the calling app context?

[y-lohse]

I think whenever we use BarLeft/Center/Right, we want the app's context. In some case we don't need it, maybe because we're not using t or anything else that requires the context, but those are rare and would probably benefit from the context as well.

[Crash--]

We can imagine that if we really don't need the app's context and use the bar's one, we can add a props withAppContext. By default this props is true.

<BarRight>
 {moreMenu}
</BarRight>

//no store / client / t / router injected from the app
<BarRight withAppContext={false}>
{moreMenu}
</BarRight>

[Crash--]

We should also add MuiCozyTheme to the provided context