I noticed recently when using vimdiff and a 'diffexpr' that the
screen is no longer redrawn properly after certain commands such as
:diffu. Sometimes the screen is left completely blank; at other
times only a few scattered characters are redrawn. Typing Ctrl-L
fixes the display.
This can be demonstrated as follows. Create a vimrc file with these
contents.
---------------------------- vimrc.test ----------------------------
set diffexpr=MyDiff()
function MyDiff()
silent execute "!diff" v:fname_in v:fname_new ">" v:fname_out
endfunction
--------------------------------------------------------------------
The MyDiff() function was copied from ":help diff-diffexpr" and
simplified. (I normally use a MyDiff() function that differs
slightly from the example.)
Then execute this command, where file1 and file2 are two text files.
Their contents don't matter.
vimdiff -N -u vimrc.test --noplugin file1 file2
Then execute
:diffu
Notice that not all of the screen is redrawn. This happens when
executing other commands, too, such as
:set diffopt+=iwhite
This does not happen if 'diffexpr' is not set.
I am using a normal build of Vim 7.4.526 and running on Fedora 14
and Fedora 17.
I'm not sure exactly when this behavior changed. I think it was
after an upgrade in early October. I can find out at work on
Monday, where I keep better records of my builds than I do at home.
Regards,
Gary
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