In the new library, make it easier and quicker to hide/display content of a folder

In the new library, to hide all content of a folder or display it all, one needs to tap the eye icon and then select the action. Previously, one could just hide/show all with a simple tap and only if it was not clear what user wanted was a menu shown. I would love it if the old behaviour would come back.

The new behaviour should be:

1. When everything in the folder is hidden, tappign the eye icon makes it visible.

2. When everything in the folder is visible, tapping the eye icon makes it hidden.

3. When some items in a folder are visible and others are hidden, the current menu gets displayed. Also, a long tap on the eye should show the menu.

Note that probably a third icon (maybe eye with dashed and not full line over it) could be added to indicate the state when the visibility of folder content is varied.

Taping the eye icon for individual tracks and points is already straightforward, so this would be consistent. The actions to hide or show all are already accessible through the three dots menu in top right, so this would not hide any functionality. The "Include sub-folders" checkbox should probably be included in this three dot menu.