Created attachment 121933 [details]
The File/Quit menu item not being highlighted

When a menu is taller than the screen height, it is clipped, with arrows on top and bottom for scrolling.  However, the newly scrolled menu items don't highlight when the mouse cursor is moving over them, and clicking on e.g. "Quit" from the "File" menu has no effect.  The menu items which were already visible when the menu opened DO respond to mouse movement and clicking; only the previously hidden menu items have this issue.  This happens with LibreOffice 5.0.3 from Fedora 23; version 4.4.7 from Fedora 22 works as expected.

Workaround: use the up/down arrow keys to navigate in the menu, once opened.  The menu items are highlighted correctly, and pressing Enter activates the menu, triggering the expected action.

I attached a screenshot taken on a netbook running the Fedora 23 XFCE Spin, showing the File/Quit menu item not responding.  I have the same problem with any menu needing scrolling, not just in Calc but also in Writer (didn't try Impress).  In the screenshot, the last 3 menu items were initially not visible, and don't react to mouse events.