Bug 415476 - SWING: SwingScoutClipboardService.setContents(..)-copied content cannot be pasted within scout application

https://bugs.eclipse.org/bugs/show_bug.cgi?id=415476

Backport of change in 3.10.0 M2
Bug 377922: Swing: Wrong display of configured splitter position in split box

https://bugs.eclipse.org/bugs/show_bug.cgi?id=377922

Backport from 3.10.0-M2

Patch contributed by Jérémie Bresson <jbr@bsiag.com>