2.4.0-beta-2 possible regression: Float inset stops instant preview

[Eric Barkan]

As requested, I've compiled the user guide with 2.4.0-beta2 on Fedora 
37. The compile succeeds and the resulting PDF looks perfect, at least 
on a quick scan-through.  However, I noticed that instant preview is not 
working for the UserGuide.lyx file, similarly to my originally posted 
bug, and that some errors appeared on the terminal (see below).


I also successfully compiled the Math guide.  There were just a few 
normal-looking messages on the terminal and instant preview does work 
for this file.


Here's the terminal output for UserGuide.lyx:


Error: No DVI or PDF output. latex failed.
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) 
(preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./UserGuide.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
This is BibTeX, Version 0.99d (TeX Live 2021)
The top-level auxiliary file: UserGuide.aux
The style file: 1_usr_share_lyx-devel_doc_biblio_alphadin.bst
Database file #1: 0_usr_share_lyx-devel_doc_biblio_LyXDocs.bib
Warning--I didn't find a database entry for "enumitem"
Warning--I didn't find a database entry for "latexcompanion"
Warning--I didn't find a database entry for "latexguide"
Warning--I didn't find a database entry for "AMS"
Warning--I didn't find a database entry for "prettyref"
Warning--I didn't find a database entry for "refstyle"
Warning--I didn't find a database entry for "lyxcredit"
Warning--I didn't find a database entry for "BibTeX-2"
Warning--I didn't find a database entry for "Biblatex"
Warning--I didn't find a database entry for "BibTeX"
Warning--I didn't find a database entry for "biber"
Warning--I didn't find a database entry for "latexbook"
Warning--I didn't find a database entry for "makeindex"
Warning--I didn't find a database entry for "xindex"
Warning--I didn't find a database entry for "xindy"
Warning--I didn't find a database entry for "makeindex-man"
Warning--I didn't find a database entry for "TeXCatalogue"
Warning--I didn't find a database entry for "nomencl"
Warning--I didn't find a database entry for "hyperref"
Warning--I didn't find a database entry for "caption"
Warning--I didn't find a database entry for "fancyhdr"
Warning--I didn't find a database entry for "Arabic"
Warning--I didn't find a database entry for "Armenian"
Warning--I didn't find a database entry for "Cyrillic"
Warning--I didn't find a database entry for "Farsi"
Warning--I didn't find a database entry for "Hebrew"
Warning--I didn't find a database entry for "Japanese"
Warning--empty edition in Kopka
Warning--empty edition in Lamport
Warning--empty edition in Mittelbach
(There were 30 warnings)
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) 
(preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./UserGuide.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
This is BibTeX, Version 0.99d (TeX Live 2021)
The top-level auxiliary file: UserGuide.aux
The style file: 1_usr_share_lyx-devel_doc_biblio_alphadin.bst
Database file #1: 0_usr_share_lyx-devel_doc_biblio_LyXDocs.bib
Warning--I didn't find a database entry for "enumitem"
Warning--I didn't find a database entry for "latexcompanion"
Warning--I didn't find a database entry for "latexguide"
Warning--I didn't find a database entry for "AMS"
Warning--I didn't find a database entry for "prettyref"
Warning--I didn't find a database entry for "refstyle"
Warning--I didn't find a database entry for "lyxcredit"
Warning--I didn't find a database entry for "BibTeX-2"
Warning--I didn't find a database entry for "Biblatex"
Warning--I didn't find a database entry for "BibTeX"
Warning--I didn't find a database entry for "biber"
Warning--I didn't find a database entry for "latexbook"
Warning--I didn't find a database entry for "makeindex"
Warning--I didn't find a database entry for "xindex"
Warning--I didn't find a database entry for "xindy"
Warning--I didn't find a database entry for "makeindex-man"
Warning--I didn't find a database entry for "TeXCatalogue"
Warning--I didn't find a database entry for "nomencl"
Warning--I didn't find a database entry for "hyperref"
Warning--I didn't find a database entry for "caption"
Warning--I didn't find a database entry for "fancyhdr"
Warning--I didn't find a database entry for "Arabic"
Warning--I didn't find a database entry for "Armenian"
Warning--I didn't find a database entry for "Cyrillic"
Warning--I didn't find a database entry for "Farsi"
Warning--I didn't find a database entry for "Hebrew"
Warning--I didn't find a database entry for "Japanese"
Warning--empty edition in Kopka
Warning--empty edition in Lamport
Warning--empty edition in Mittelbach
(There were 30 warnings)
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) 
(preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./UserGuide.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
This is makeindex, version 2.15 [TeX Live 2021] (kpathsea + Thai support).
Scanning input file UserGuide.idx....done (360 entries accepted, 0 
rejected).
Sorting entries......done (3204 comparisons).
Generating output file UserGuide.ind....done (396 lines written, 0 
warnings).
Output written in UserGuide.ind.
Transcript written in UserGuide.ilg.
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) 
(preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./UserGuide.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) 
(preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./UserGuide.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
kf.service.services: KApplicationTrader: mimeType 
"x-scheme-handler/file" not found

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