Clear style cache for connected edges when 'display' property changed.

[mikekucera]

Associated issues: #3070

• Fix for bug Connected edge not rendered after hiding and showing node with display: none #3070
• Clears the style cache for edges connected to a node when the 'display' property changes.
• Adds the testcase created by @drauggres to the tests.js file.

Checklist

Author:

• The proper base branch has been selected. New features go on unstable. Bug-fix patches can go on either unstable or master.
• Automated tests have been included in this pull request, if possible, for the new feature(s) or bug fix. Check this box if tests are not pragmatically possible (e.g. rendering features could include screenshots or videos instead of automated tests).
• The associated GitHub issues are included (above).
• Notes have been included (above).

Reviewers:

• All automated checks are passing (green check next to latest commit).
• At least one reviewer has signed off on the pull request.
• For bug fixes: Just after this pull request is merged, it should be applied to both the master branch and the unstable branch. Normally, this just requires cherry-picking the corresponding merge commit from master to unstable -- or vice versa.