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bug#18143: Vertical scroll bar does not work with Image files

From: Angelo Graziosi
Subject: bug#18143: Vertical scroll bar does not work with Image files
Date: Tue, 29 Jul 2014 14:13:27 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Il 29/07/2014 14:02, Eli Zaretskii ha scritto:
Date: Tue, 29 Jul 2014 12:56:26 +0200
From: Angelo Graziosi <address@hidden>

When an image file (jpg, png..) is displayed greater than the frame
dimensions, a way to explore it is using the arrow keys (up, down, left
and right).

With the introduction of horizontal scroll bar, it is very nice to use
it in place of L-R arrow keys: the HSB works fine here!

This does not occur with vertical scroll bar. It has the full height of
the frame and cannot be moved U-D. So the only way to explore the image
vertically is to use the U-D keys.

I see this both with MSYS2/MinGW64 and Cygwin builds of Emacs trunk.

What you see is due to the difference between the 2 scroll bars in how
the size of the scroll-bar thumb is computed: in character units for
the vertical scroll bar vs pixel units for the horizontal scroll bar.

But is this a bug? I would convert also the vertical scroll bar to pixel unit..

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