The command zt, which scrolls the current line to the top of the
screen, does not always work in a window that's in diff mode.
Depending on the line that the cursor is on, it either works
correctly, scrolls the current line part way up the screen, or has
no effect at all.
Here is an example, using terminal vim in a 24-line terminal (xterm)
window.
$ vimdiff -N -u NONE <(seq 30; seq 61 90) <(seq 90)
31G
The cursor is on the line with the text "61" and at the bottom of
the screen. Type
zt
The left window now looks like this, with cursor still on the "61"
line. This is not the behavior I would expect and seems wrong.
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
--------------------------------------
61
62
63
64
65
66
+ +-- 24 lines: 67--------------------
Type
zt
again. There is no change. Now move the cursor to the line with
"62" and repeat:
j
zt
There is still no change to the window. Now move the cursor to the
next line, containing "63" and repeat:
j
zt
This time, that line is put at the top of the screen as one would
expect. The window now looks like this, as I would expect.
63
64
65
66
+ +-- 24 lines: 67--------------------
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
Moving the cursor up a line with k redraws the screen to look as in
the first illustration above. This also seems wrong.
I am using Vim 7.4.808 in an xterm on a system running Fedora 17
Linux. FWIW, the behavior is the same in 7.3.444, so this is not
new.
Regards,
Gary
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