docs: remove outdated blank screen issue

[MikeMcC399]

Issue

README > Common problems > Blank screen in Chrome contains the following advice:

When running headed tests with X11 forwarding in Cypress v4 you might see a blank Chrome screen. Try disabling memory sharing by setting the following environment variables:

export QT_X11_NO_MITSHM=1
export _X11_NO_MITSHM=1
export _MITSHM=0

• See issue #270

• issue #270 was closed in March 2020.

---

• The variables mentioned have progressed through to https://github.com/cypress-io/cypress-docker-images/blob/47149ea3d5b58dae09139ae5a523d7ffd129bc91/factory/factory.Dockerfile#L17-L21

  where these are promulgated to all current Cypress Docker images.

Change

Since a manual workaround is no longer necessary, the section README > Common problems > Blank screen in Chrome is removed from the README document.

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

Preview

https://github.com/MikeMcC399/cypress-docker-images/blob/remove/blank-screen-issue/README.md#common-problems