Bug#236611: xdvi magnifier flickers when moving

[Stefan Ulrich <stefan.ulrich@zen.co.uk>]

Enrico Zini <enrico@debian.org> writes:

> This is just a minor flaw in xdvi: when right-dragging on a document,
> you get the big magnifier you can more around.  However, if you do that,
> during moves there is a white flicker between every update, probably due
> to lack of double buffering.

Yup; AFAIK there are no plans to implement double buffering.
It would be a rather large change since currently xdvi draws
everything `on demand'. If I'm not mistaken, using double
buffering would e.g. make switching the pages slower than
it currently is

> Also (I just noticed it while writing this report), the rulers at the
> sides of the magnifier appear only after the magnifier has been moved,
> but not in the first show when it pops up.

That's a feature - from the man page of current xdvik-22.81
(I think this description was missing in earlier versions of the
man page):
   
       When the magnifier is moved, small ruler-like tick marks
       are displayed the edges of the magnifier (unless the X re-
                     ^ err, should be an `at' there ...
       source delayRulers is set to false, in which case the tick
       marks will always be displayed).

-- 
Stefan Ulrich