I haven't found any good solutions, but here's another workaround: set TMPDIR to the directory where your schematic is. Then git will put the temporary files in the same place.
export TMPDIR=$PWD/examples/TwoStageAmp; git difftool -x schdiff 0e506ebd5d5c..11f91c04a33e -- examples/TwoStageAmp/TwoStageAmp.sch
I haven't found any good solutions, but here's another workaround: set TMPDIR to the directory where your schematic is. Then git will put the temporary files in the same place.
export TMPDIR= $PWD/examples/ TwoStageAmp; git difftool -x schdiff 0e506ebd5d5c. .11f91c04a33e -- examples/ TwoStageAmp/ TwoStageAmp. sch