Page overflows when using Longtable and Floats on same page

Question

I am part of a team working collaboratively to prepare a large document containing tabular and multimedia content using LaTeX (publishing to PDF using lualatex), and we've hit a persistent problem with one page in our document having text content spill over the end of the page as follows:

We believe we've tracked down why, and the following is the MWE used to produce the above:
documentclass[a4paper]{report}
usepackage[margin=2.54cm]{geometry}
usepackage{lipsum}

%usepackage{showframe}
usepackage{longtable}
usepackage[draft]{graphicx}

%graphicspath{ {Resources/} }

begin{document}
Lorem ipsum dolor sit amet, consectetur adipiscing elit.

section{Section here}

subsection{Subsection here}

lipsum[1-2]

begin{figure}
caption{Caption 1}
includegraphics[height=9.24cm]{image1.png}
end{figure}

subsection{Subsection here}

lipsum[1]

begin{figure}
caption{Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed consequat ex vitae}
includegraphics[height=9.60cm]{image2.png}
end{figure}

lipsum[1-3]

begin{longtable}{|p{2cm}|p{2cm}|p{2cm}|p{2cm}|p{2cm}|p{2cm}|}
cline{1-6}
 & Text & Text & Text & Text & Text 
cline{1-6}
end{longtable}

lipsum[1-6]

end{document}

The issue we're hitting appears to be the bug documented at https://www.latex-project.org/cgi-bin/ltxbugs2html?pr=tools/3512, caused by the longtable package incorrectly resetting the pagegoal erroneously when it follows a float.
There's a suggested fix on the issue, and this has been discussed before at Pagebreak doesn't work with floats and longtabu, but in both cases the fix now predates the current version of Longtable, and we would ideally like to avoid trying to maintain a patched version of Longtable across our whole team.
Is anyone aware of a document-local fix to this that we could use as an alternative?

David Carlisle · Answer

Sorry, I try to keep the bug report turnaround to under 20 years, but it's not always easy....

You can make the changes suggested in the report that you reference in-document rather than modifying the .sty file.

documentclass[a4paper]{report}
usepackage[margin=2.54cm]{geometry}
usepackage{lipsum}

%usepackage{showframe}
usepackage{longtable}

makeatletter
defLT@start{%
  letLT@startendgraf
  endgrafpenaltyz@vskipLTpreendgraf
  dimen@pagetotal
  advancedimen@ htifvoidLT@firstheadLT@headelseLT@firstheadfi
  advancedimen@ dpifvoidLT@firstheadLT@headelseLT@firstheadfi
  advancedimen@ htLT@foot
  dimen@iivfuzz
  vfuzzmaxdimen
    setboxtw@copyz@
    setboxtw@vsplittw@ to ht@arstrutbox
    setboxtw@vbox{unvboxtw@}%
  vfuzzdimen@ii
  advancedimen@ ht
        ifdimht@arstrutbox>httw@@arstrutboxelsetw@fi
  advancedimen@dp
        ifdimdp@arstrutbox>dptw@@arstrutboxelsetw@fi
  advancedimen@ -pagegoal
  ifdim dimen@>z@vfilbreakfi
      global@colroom@colht
  ifvoidLT@footelse
%    advancevsize-htLT@foot
     globaladvancevsize-htLT@foot
    globaladvance@colroom-htLT@foot
    dimen@pagegoaladvancedimen@-htLT@footpagegoaldimen@
    maxdepthz@
  fi
  ifvoidLT@firstheadcopyLT@headelseboxLT@firstheadfinobreak
  output{LT@output}}

defendlongtable{%
  crcr
  noalign{%
    letLT@entryLT@entry@chop
    xdefLT@save@row{LT@save@row}}%
  LT@echunk
  LT@start
  unvboxz@
  LT@get@widths
  if@filesw
    {letLT@entryLT@entry@writeimmediatewrite@auxout{%
      gdefexpandafternoexpand
        csname LT@romannumeralc@LT@tablesendcsname
          {LT@save@row}}}%
  fi
  ifxLT@save@rowLT@@save@row
  else
    LT@warn{Column @width s have changedMessageBreak
             in table thetable}%
    LT@final@warn
  fi
  endgrafpenalty -LT@end@pen
%
  ifvoidLT@footelse
    globaladvancevsizehtLT@foot
    globaladvance@colroomhtLT@foot
    dimen@pagegoaladvancedimen@htLT@footpagegoaldimen@
  fi
%
  endgroup
  global@mparbottomz@
%  pagegoalvsize
  endgrafpenaltyz@addvspaceLTpost
  ifvoidfootinselseinsertfootins{}fi}

defLT@output{%
  ifnumoutputpenalty <-@Mi
    ifnumoutputpenalty > -LT@end@pen
      LT@err{floats and marginpars not allowed in a longtable}@ehc
    else
      setboxz@vbox{unvbox@cclv}%
      ifdim htLT@lastfoot>htLT@foot
        dimen@pagegoal
%
advancedimen@htLT@foot
%
        advancedimen@-htLT@lastfoot
        ifdimdimen@<htz@
          setbox@cclvvbox{unvboxz@copyLT@footvss}%
          @makecol
          @outputpage
%
            globalvsize@colroom
%
          setboxz@vbox{boxLT@head}%
        fi
      fi
%      global@colroom@colht
%      globalvsize@colht
%      vbox
%        {unvboxz@boxifvoidLT@lastfootLT@footelseLT@lastfootfi}%
      unvboxz@ifvoidLT@lastfootcopyLT@footelseboxLT@lastfootfi
    fi
  else
    setbox@cclvvbox{unvbox@cclvcopyLT@footvss}%
    @makecol
    @outputpage
      globalvsize@colroom
    copyLT@headnobreak
  fi}

makeatother

usepackage[draft]{graphicx} 

%graphicspath{ {Resources/} }

begin{document}
Lorem ipsum dolor sit amet, consectetur adipiscing elit.

section{Section here}

subsection{Subsection here}

lipsum[1-2]

begin{figure}
caption{Caption 1}
includegraphics[height=9.24cm]{image1.png}
end{figure}

subsection{Subsection here}

lipsum[1]

begin{figure}
caption{Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed consequat ex vitae}
includegraphics[height=9.60cm]{image2.png}
end{figure}

lipsum[1-3]

begin{longtable}{|p{2cm}|p{2cm}|p{2cm}|p{2cm}|p{2cm}|p{2cm}|}
cline{1-6}
 & Text & Text & Text & Text & Text 
cline{1-6}
end{longtable}

lipsum[1-6]

end{document}

Page overflows when using Longtable and Floats on same page

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