OPEN - task 440: LogViewer application and Shift application integration
http://github.com/ControlSystemStudio/cs-studio/issues/issue/440

fixing the new line char
#530: Logbook screenshot of Window or whole screen on Linux contains
remains of dialog

Fixed the screenshot behavior for log dialog.
Merge pull request #558 from shroffk/3.3.x_issue530

3.3.x issue530