gitk: orphaned git process

[max630]

[max630]

commandline: git diff-tree -r -s --stdin -- $FILES

happens during search with "touching paths"

[max630]

after killing git, there is message to console: "oops, git diff-tree died"

[max630]

https://github.com/max630/git/commits/tmp/autoclose-read-tree

[max630]

After switching to "containing:" from paths selection, selection in commits view are reset, but in file view stays

[max630]

Seems to fail in a scenario:

• initialize search
• rebase the commits which involve the file being serached
• Refresh with F5

Expected: shows correctly
Result: seems like all selections is gone.

PS: not reproduced before the fix