[PATCH] gitk: avoid error on reload

When hitting "Reload", gitk can error out, complaining about "wrong # coordinates: expected 0 or 4, got 2". This patch checks that there are 4 coordinates to avoid this error:

wrong # coordinates: expected 0 or 4, got 2
wrong # coordinates: expected 0 or 4, got 2
    while executing
".tf.histframe.pwclist.canv create rect -outline {} -tags secsel -fill gray85"
    ("eval" body line 1)
    invoked from within
"eval $canv create rect [$canv bbox $linehtag($l)] -outline {{}}  -tags secsel -fill [$canv cget -selectbackground]"
    (procedure "make_secsel" line 6)
    invoked from within
"make_secsel $l"
    (procedure "selectline" line 62)
    invoked from within
"selectline [rowofcommit $pending_select] 1"
    (procedure "layoutmore" line 12)
    invoked from within
"layoutmore"
    (procedure "chewcommits" line 5)
    invoked from within
"chewcommits"
    ("eval" body line 1)
    invoked from within
"eval $script"
    (procedure "dorunq" line 9)
    invoked from within
"dorunq"
    ("after" script)

Signed-off-by: Michele Ballabio <barra_cuda@katamail.com>
---

I don't know if this patch is the right fix, so here is a script that triggers this error:

--->8--- #!/bin/sh

rm -rf .git git init touch initial git add initial git commit initial -m "initial"

git checkout -b m-master

sleep 1 touch one git add one git commit one -m "one" sleep 1 touch two git add two git commit two -m "two" sleep 1 touch three git add three git commit three -m "three"

sleep 1 echo "Now reorder the commits as:" echo "pick three" echo "pick one" echo "pick two" read git rebase -i master

git checkout -b m-reload master

sleep 1 touch four git add four git commit four -m "four" sleep 1 touch five git add five git commit five -m "five"

git checkout m-master

gitk --all # within gitk, reload: it should give an error. # if it does not error out, checkout another branch and try # to reload again. ---8<---

 gitk |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)