app: Add regression testing for sessionrc/docks
Add a regression test for sessionrc parsing, handing and writing. The test work in the following way: GIMP starts so that sessionrc is deserialized and stored internally, the UI is shown, and then the internal data structure about windows is serialized to a new sessionrc. The test makes sure that a new sessionrc actually has been created, and then that the content of the new file is identical to the old one.
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