When using the "-s" option with Yap to go to a
particular source-special in the dvi file, the present
version of Yap highlights the location with a very dim,
grey marker. It is often a little difficult to find
this marker on a large page of text and formulae.
A more prominent highlight of the location would be
useful. A good example is what is done in Kdvi: a brief
animation attracts the user's eye to the location.
Another good example is what is done with the recent
version of TexShop on Mac OS X.
If the marker is more prominent, it might be
appropriate to make it temporary: i.e. perhaps the user
can remove the visible marker with a keystroke (a
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