Re: gnus-auto-center-summary off-center

[Shenghuo ZHU <zsh@cs.rochester.edu>]

>>>>> "Rat" == Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

Rat> What I think is happening is that the mode line bezel makes the
Rat> mode line "taller" than a line of text.  XEmacs laps the bezel
Rat> over the buffer text, producing your "half-chopped-off line".
Rat> This is not a bug, it is normal and correct behaviour for XEmacs.
Rat> When you select the last message in the summary buffer, XEmacs
Rat> scrolls up the entire window by 1 line so that the full text of
Rat> the line is displayed without being cropped.

Rat> What happens if you reduce the size of the mode line bezel to 0
Rat> with `(set-specifier modeline-shadow-thickness 0)'?  This will
Rat> make XEmacs' mode lines look like FSF Emacs mode lines and should
Rat> make the cropping problem go away.

Rat> I normally use XEmacs without mode line bezels.  Your "fix"
Rat> really screws up the display, I am sorry to say.

Unfortunately, it is not the case. The mode line bezel does not make
Gnus get wrong answer. In XEmacs, Gnus use `window-displayed-height'
to calculate the height of the window. I guess
`window-displayed-height' has count the thickness of the mode line
bezel. And I never said it is a bug of XEmacs.

But, it is the *displayed* height. When Gnus scrolls the summary
lines, some lines leaves the windows, and other lines enter. Then the
window-displayed-height may change, since the font size of lines may
be different. In the case that the last line is the current line, Gnus
may scroll it half-chopped-off or even out of the window.  This is the
bug I tried to fix.

-- 
Shenghuo ZHU