Bug 571954 - Replace obsolete BufferedCanvas with standard SWT Buffering

SWT offers a standard way of handling double buffering hence we can
replace the custom implementation with a default SWT canvas. Windows
requires the double-buffering flag for that the other platforms do that
automatically.

Change-Id: I799d32c3cf40fbfaac94ab0e5506c8e777fe1ae7
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
2 files changed