Fix EZP-23715: Impossible browse the media library with the PlatformUI
Fix EZP-23099: In Firefox, the height of the tree is not limited
Merge pull request #131 from ezsystems/ezp-23099_tree_height_firefox

Fix EZP-23099: In Firefox, the height of the tree is not limited
Merge pull request #127 from ezsystems/ezp-23715_media_lib

Fix EZP-23715: Impossible browse the media library with the PlatformUI