navigation in diff mode with the csv plugin

If the csv plugin is used while editing two files using gvimdiff, then
the number of key strokes to navigate out of a fold is equal to the
number of lines in that fold. Normally, this would be a single key
stroke. Here the key stroke can be a right or left arrow depending on
whether the user is trying to navigate down or up.

To reproduce the issue, consider the following files.

rajulocal@hogwarts:~/x$ cat file3.csv
k,k,k
a,a,a
m,m,m
a,a,a
r,r,r
a,a,a
j,j,j
u,u,u
k,k,k
a,a,a
m,m,m
a,a,a
r,r,r
a,a,a
j,j,j
u,u,u
rajulocal@hogwarts:~/x$ cat file4.csv
1,1,1
2,2,2
3,3,3
k,k,k
a,a,a
m,m,m
a,a,a
r,r,r
a,a,a
j,j,j
u,u,u
k,k,k
a,a,a
m,m,m
a,a,a
r,r,r
a,a,a
j,j,j
u,u,u
1,1,1
2,2,2
3,3,3

When I do
rajulocal@hogwarts:~/x$ gvimdiff file3.csv file4.csv

The lines 7-10 in file3.csv, 10-13 in file4.csv are folded into a
single line. However, to traverse down the fold, I need to use the
right arrow key 4 times instead of just one.

I am using a Debian Jessie machine with the following vim packages

rajulocal@hogwarts:~/x$ dpkg -l vim\* | grep ^ii
ii vim 2:7.4.488-2 amd64 Vi IMproved - enhanced vi editor
ii vim-common 2:7.4.488-2 amd64 Vi IMproved - Common files
ii vim-gtk 2:7.4.488-2 amd64 Vi IMproved - enhanced
vi editor - with GTK2 GUI
ii vim-gui-common 2:7.4.488-2 all Vi IMproved - Common GUI files
ii vim-runtime 2:7.4.488-2 all Vi IMproved - Runtime files
ii vim-tiny 2:7.4.488-2 amd64 Vi IMproved - enhanced
vi editor - compact version

The csv plugin, csv-0.30.vmb is from
http://www.vim.org/scripts/script.php?script_id=2830

The problem occurs only when the filetype is set to 'csv'. If I
manually change it to 'text', then there is no problem.

thanks
raju
--
Kamaraju S Kusumanchi
http://malayamaarutham.blogspot.com/

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