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[xterm.h] note on 'dragging' field of 'struct scroll_bar'
From: |
Dmitry Antipov |
Subject: |
[xterm.h] note on 'dragging' field of 'struct scroll_bar' |
Date: |
Tue, 10 Jan 2012 17:58:01 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 |
I want to notice about the placement of 'dragging' field within 'struct
scroll_bar'.
It's a Lisp_Object, but placed so it's not reachable by the marking traversal.
IIUC,
it works just because it's always an integer, Qnil or Qt; but this is a
potential trap
for someone who will change this someday. So, I think it's better to use plain
C 'int'
instead, or move 'dragging' up to the head of 'struct scroll_bar' before
'x_window'.
And, the more general question is: why not use the same 'struct scroll_bar'
both for
X and Win32 code?
Dmitry
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