[ROOT-7819] ctest: diff order unintuitive - SFTJIRA

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Hi,

It seems that the order of the diff is the reverse of the intuitive one, for example

ctest -R roottest-root-rint-TabCom

.....

562: -- BEGIN ERRDIFF OUTPUT --

562: --- /opt/build/root_builds/roottest_cmake/root/rint/roottest-root-rint-TabCom.err	Tue Nov 24 14:28:13 2015

562: +++ /Users/pcanal/root_working/code/roottest.master/root/rint/TabCom.eref	Mon Nov  9 14:24:34 2015

562: @@ -1,4 +1,4 @@

562: -input_line_11:2:3:error:useofundeclaredidentifier'TObj'

562: +input_line_10:2:3:error:useofundeclaredidentifier'TObj'

562:  (TObj)

562:  ^

562:  ROOT_prompt_1:1:--:error:nomembernamed'k'in'TObject'

562:

562: -- END ERRDIFF OUTPUT --

where the diff command looks it is:

diff actual_output  reference_output

where the reverse is more natural (as it send shows the line added compared tot he reference as a +, for example).

Thanks,
Philippe.