Changes to the LyX format since version 220 (LyX 1.2.0) was released.
=====================================================================

2002-08-02  Angus Leeming  <leeming@lyx.org>

Added a boolean "preview" flag to InsetCommandParams.
Currently it is written only by InsetInclude, because only this
class can generate a preview of its contents.

The LyX file now contains:

 \begin_inset Include \input{snapshot_t=40.tex}
+preview true

 \end_inset 

Earlier versions of LyX just swallow this extra token silently.