TYPO3 Core

Can this be considered the same issue? #87825

Yes - or at least it is similar.
But since there is now the possibility to collapse the page tree (even if unconsciously), something should be done here. Be it deactivating the (collapse) keyboard shortcut for the root page or adding the icon.

Ok. I've already linked the two issues as related :) Thanks.

The root node can only be collapsed using the keyboard (pressing LEFT key). It can be opened again be pressing the RIGHT key or refreshing the tree view, so it is not a blocking issue, as in my tests the tree is uncollapsed on the next reload of the tree at latest.

There is a discussion in Slack (https://typo3.slack.com/archives/C03AM9R17/p1575477757384800) on whether the toggle button should also be shown when having a single root node or the keyboard action for LEFT key should be disabled for a single root node.

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62544

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62544