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Re: xterm.c (x_clear_frame) - commented out call to XClearWindow

From: Chong Yidong
Subject: Re: xterm.c (x_clear_frame) - commented out call to XClearWindow
Date: Wed, 23 Nov 2011 14:09:27 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (gnu/linux)

Jan Djärv <address@hidden> writes:

> It would be nice if we could just fix ther leftover spaces.  But I
> think it is too long in to pretest to fix this.  You have to first
> find all leftover spaces (i.e. under/between scroll bars, minibuffer,
> fringe) in all cases (font size not a multiple of frame size,
> fullscreen, and so on) and in all configurations (lucid, Gtk, just X,
> motif, with or without native scrollbars, with or without Xaw3d
> scrollbars).

AFAICT, we know where the extra spaces are: they're to the right of the
scroll bar, below the echo area, and to the right of the echo area.  It
shouldn't be difficult to clear precisely these three areas.

> And then for different environments, some redraw errors only appears
> with XFCE, some with Gnome-shell.

Any idea why?  I don't understand why the redisplay engine should behave
differently on different desktop environments.  If so, surely we'll have
bigger problems than merely unpainted frame areas.

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