Bug#1144521: src:gstreamer1.0: fails to migrate to testing for too long

reassign 1144521 mopidy
tags 1144521 + patch
thanks

I am re-assigning this to mopidy because I think the test on
`plain.txt` has too little context to succeed. Minor improvements in
typefind (gst-plugins-base1.0) result in the single line text file to
be detected as a subtitle format.

The patch attached extends the plain.txt file with an extra line and
lets the test succeed again.

Index: mopidy/tests/data/scanner/plain.txt
===================================================================
--- mopidy.orig/tests/data/scanner/plain.txt
+++ mopidy/tests/data/scanner/plain.txt
@@ -1 +1,3 @@
 Some plain text file with nothing special in it.
+
+Add some extra lines to make it a bit longer and see how the scanner handles it.