Created attachment 4935 
Patch implementing the functionality.

This patch implements an option in the xfce4-terminal preferences called
Unlimited scrollback.
This is a checkbox that is disabled by default, but when enabled will ignore
the scrollback limit option and will allow the terminal to have an undetermined amount
of lines.
This is useful when you've an application which outputs a lot of lines in the
terminal that you've to analyze.

The following changes since commit a84b3f6d60704098b59ad11c47c8a34e07038851

l10n: Updated Bulgarian (bg) translation to 100%

are available in this git repository
git://github.com/weltall/xfce4-terminal.git