i3 - improved tiling WM

Bugfix: Quote external shell script that is called in some cases.

Patch status: needinfo

Patch by Stefan Schroeder

Long description:

Now the call to the script that was created on-the-fly will
also work when TMPDIR contains white space.

fixes #971

To apply this patch, use:
curl http://cr.i3wm.org/patch/64/raw.patch | git am

b/i3-dmenu-desktop

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@@ -401,13 +401,13 @@ if (exists($app->{Terminal}) && $app->{Terminal}) {
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     binmode($fh, ':utf8');
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     say $fh <<EOT;
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 #!/bin/sh
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-rm $filename
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+rm "$filename"
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 exec $exec
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 EOT
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     close($fh);
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     chmod 0755, $filename;
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-    $cmd = qq|exec i3-sensible-terminal -e "$filename"|;
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+    $cmd = qq|exec i3-sensible-terminal -e "'$filename'"|;
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 } else {
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     # i3 executes applications by passing the argument to i3’s “exec” command
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     # as-is to $SHELL -c. The i3 parser supports quoted strings: When a string