Define colour and background for filebrowser edit field

[krassowski]

References

Fixes #13894

Code changes

Defines a colour to prevent system input colour from interfering.

User-facing changes

No changes in light theme. In dark theme:

Before	After

Backwards-incompatible changes

None

[jupyterlab-probot]

Thanks for making a pull request to jupyterlab!
To try out this branch on binder, follow this link:

[krassowski]

@facusapienza21 would you mind testing on binder (https://mybinder.org/v2/gh/krassowski/jupyterlab/fix-contrast-file-rename?urlpath=lab) to see if the proposed change fixes the problem for you and that it works acceptably in both light and dark theme?

[fperez]

Excellent, at least from binder testing it fixes the problem as I was seeing it. Many thanks!

[fperez]

BTW, this should go into both the 3.5 and 3.6 branches - right now 3.5 is super annoying to use in light mode b/c of this problem (at least for all our students, which is a lot of people :)

[facusapienza21]

The solution in the Binder link works for me too.

[krassowski]

Merging this and backporting for potential inclusion in 3.6.0 (otherwise it will go into 3.6.1), CC @fcollonval.

@meeseeksdev please backport to 3.6.x

[krassowski]

@meeseeksdev please backport to 3.5.x

[fperez]

Fantastic, huge thanks @krassowski and our wonderful bot :)