Mouse wheel in journal is not disabled by "Options" panel.
In the journal, clicking the "Options" button shows a panel on top of the journal (with the "Topic" and "Quests" buttons) and hides the "Prev" and "Next" buttons. However, the mouse wheel can still turn pages. In this case, the "Prev" and "Next" buttons are brought back, the "Close" button disapears, and the right journal page is drawn on top of the "Options" panel.
Attached is a screenshot of what happens after using the wheel to turn a page in this situation.
Version used is from git, commit 5aeabe22.
(RM-2855 from redmine: created on 2015-08-15 by Alexandre Bury, , closed on 2015-08-17 by scrawl .)