Cannot set bigger sp values

[Kornel Benko]

This error is in branch and in trunk. Independent of Qt version.

If I try to set e.g. horizontal space between xx with value like 1300000sp, the 
dialog accepts it,
but saved lyx file is missing the value.
(This is not a too big value, it's about 7mm)

In lyx-file: Instead of having
        x
        \begin_inset space \hspace{}
        \length 1300000sp
        \end_inset
        
        x
I see only
        x
        \begin_inset space \hspace{}
        \end_inset
        
        x
which is wrong. Consequently creation of pdf errors out.

Editing the exported tex-file and setting there the desired length works, so 
this is not
latex limitation.

        Kornel

signature.asc
Description: This is a digitally signed message part.