Ronen Abravanel wrote:
> Currently, in Lyx 2.0, there are 3 modes for preview:
> * On -- Preview is working for math and preview-inset
> * No math --
> * Off
> 
> My 1st question is what the different between "no math" and Off? what else
> is previewed other than math and preview inset?

for example external insets use this mechanism to render pictures

> My second concern is the reason this mail is on the developers list: Is
> there any reason no to separate the rendering of the preview-inset from
> regular math? for 98 percent of my math -- I prefer it will not be rendered.
> But for the other two percent -- the diagrams (either using \xymatrix, the
> new \Diagram inset, or just plain-old ERT), I would really like to be
> previewed.
> 
> If it's some arbitrary decision, and you didn't thought it's important, I'll
> be happy to try and do the change..

original author is currently away... personally i have no problem with 
separating it.
i guess that you would be happy to connect "no math" with your usecase?

>(although i'll be happy for some
> pointers, as I don't yet very familiar with lyx' code).

for the insetpreview part, quick peek gives two possibly interesting commits 
38890, 33890:

git log --author=vfr |grep -A2 InsetPreview
    New file format for InsetPreview introduced in r38890.
    
    git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/tr...@33891 
a592a061-630c-0410-9148-cb99ea01b6c8
--
    Introduce InsetPreview.
    
    git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/tr...@33890 
a592a061-630c-0410-9148-cb99ea01b6c8

pavel

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