[LyX/master] Add new placeholder $${python} to configure

[José Abílio Matos]

On Saturday, 22 January 2022 19.49.26 WET Pavel Sanda wrote:
> Hi Jose,
> 
> this what I see in curent master:
> 1. start lyx
> 2. load file
> 3. this is  what I see in terminal window:
> env: '$${python}': No such file or directory
> 
> Most likely related to image preview conversions, this what I see with debug
> messages on graphics:
> graphics/PreviewLoader.cpp (757): PreviewLoader::finishedInProgress(127):
> processing failed for $${python} $$s/scripts/lyxpreview2bitmap.py --png
> "/tmp/lyx_tmpdir.LiGxsfYQmUxW/lyx_tmpbuf6/lyxpreviewGdodeo.tex" --dpi 115
> --fg ff9822 --bg 000000 --bibtex="bibtex"
> 
> 
> These binaries available on my system:
> python     python2    python2.7  python3    python3.9
> python defaults to python2.7
> 
> Pavel

The problem here is that the placeholder is not replaced before being used.
In order to see what python is being used you can see:

Help->About LyX


In a hunch does the attached patch fixes the issue?
The idea is to replace the placeholder when the converter is added/imported.

-- 
José Abílio
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