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This is to make it easier to debug test failures involving 'wait-for-screen-text': the screendump image used for the OCR is now preserved for inspection when 'wait-for-screen-text' fails. * gnu/build/marionette.scm (marionette-screen-text): Return the screendump image file as the second value. Adjust doc. (wait-for-screen-text): Add the preserved screendump image file name to the error message. Adjust doc.