Hyperref-preview conflict

[Andrew Parsloe]

On 4/11/2020 9:07 am, Yu Jin wrote:
> Am Di., 3. Nov. 2020 um 20:33 Uhr schrieb Andrew Parsloe 
> <ajparsloe at gmail.com <mailto:ajparsloe at gmail.com>>:
>
>
>     On 4/11/2020 7:03 am, Yu Jin wrote:
>>     Am So., 1. Nov. 2020 um 21:54 Uhr schrieb Andrew Parsloe
>>     <ajparsloe at gmail.com <mailto:ajparsloe at gmail.com>>:
>>
>>         LyX 2.4.0 testing, windows 10
>>
>>         Checking  Use Hyperref Support stalls display of previews on
>>         my system.
>>         I've attached two simple documents showing the effect. In
>>         2.3.5.2 the
>>         formation of previews is not stalled, but it is slowed. My
>>         (no doubt
>>         naive ) notion is that hyperref and preview should have
>>         nothing to do
>>         with each other.
>>
>>         Looking at what's going on in the Temp directory, with
>>         hyperref ON a pdf
>>         is formed of all previews in the document. After a while in
>>         2.3.5.2 the
>>         individual png-s are then formed of each preview and which
>>         then get
>>         displayed. In 2.4.0 the pdf of all previews is formed but not
>>         the
>>         individual png-s. In both cases the log shows entries like
>>
>>         Preview: Snippet 1 455554 225995 2313809
>>         [1
>>         Non-PDF special ignored!
>>         <special> ps::clippath fill
>>
>>         for each preview. With hyperref OFF no pdf is formed and each
>>         preview
>>         generates a log entry like
>>
>>         Preview: Snippet 1 4634698 235932 22609920
>>
>>
>>     Can you try following:
>>     Tolls -> Preferences -> Paths -> PATH prefix: find
>>     $LyXDir\ghostscript and change to
>>     $LyXDir\ghostscript\bin
>>
>>     report if the outcome.
>>
>     Yes, the preview now forms (in 2.4.0 testing), although it still
>     takes the 'long' route of creating a pdf in the Temp directory
>     before creating the png. The preview log shows
>
> Strange, I have tested your both files and for me it creates not .pdf 
> but .dvi files in both cases, I see no difference between the two 
> files. What do you mean with the long route, what would be the short 
> route? Hyperref off behaves differently for you? How?
>
>     Preview: Snippet 1 455554 225995 2313809
>     [1
>     Non-PDF special ignored!
>     <special> ps::clippath fill
>
> -- 
>     Eugene

I've attached the contents of the temp directory in the two cases. A pdf 
is formed in the hyperref ON case, but not in the OFF case. The 
hyperrefON.lyx file has the entries \use_hyperref true \pdf_bookmarks 
true; the hyperrefOFF.lyx file has the entry \use_hyperref false.

By the long route I meant that a pdf of the preview snippet is formed 
before the png. The short route doesn't involve forming the pdf (goes 
directly from dvi to png). Would the preview log files be of interest?

Andrew

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