[armada877]

Scroll with the mouse wheel.

• Wide layout: the wheel scrolls the panel under the pointer. Over the article it scrolls the preview, and over the list it moves the selection.
• Full-screen reader: the wheel scrolls the article.
• Narrow stream and feed picker: the wheel moves through the list.
• Each wheel step moves 3 lines or entries, and stops at the top and bottom.
• The wheel never marks an article as read. Keys and the divider do not change.

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