Drag&Drop from Command Line should always be a copy-operation

[M. Gronle]

When dragging text from the command line to the command line or to a script, no text should be deleted from the command line (especially from ‘processed lines’). Usually a move-operation should be replaced by a copy-operation.

[M. Gronle]

fixes issue #106: drag&drop from/to command line: - it is not allowed to drop something in protected lines of the command line - dragging from protected lines of the command line must always be a copy operation

→ <<cset 86a52a456678>>