Widgets copybin implementation using absolute positioning + scroll overriding.
Widgets pastebin optimized to work also with blockless editor config.
Extracted variable pasteReplaceRegex, in order to avoid multiple regex recompilations.
Avoid scroll jump on IEs by using two inline elements and focusing widget before removing copybin.
Use even longer timeout, because Chrome on Mac is too slow.
Abort when previous copy/cut has not ended yet.
[IE8] Restore scroll position after coping widget.