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Why the `click' modifier for a mouse-wheel event?

From: Drew Adams
Subject: Why the `click' modifier for a mouse-wheel event?
Date: Fri, 26 Jun 2009 10:15:35 -0700

Subject line says it all.

In Emacs 22 (and 21, 20...), using the mouse wheel did not add any modifiers to
the event that was read.  In Emacs 23, `event-modifiers' for a
`mouse-wheel-down-event' or `mouse-wheel-up-event' returns `(click)'.

Why? Is this a bug or a feature or just an inescapable implementation

This behavior doesn't seem right. Using the mouse wheel (without pressing it to
realize a click) is not the same as clicking a mouse button.

(I'm using Windows, so the `event-basic-type' for a wheel rotation is `wheel-up'
or `wheel-down'.)

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