FIX : v20 pdf space lost with images eratosthene

[thersane-john]

Need PR #31273 to be merged before

FIX pdf space lost with images on eratosthene PDF

like #31273

[eldy]

This seems to fix for some case but generate trouble on other.
Imagine the line that generate a break page with old code so output on second page and that, with new code, can be output on the first page. If this line is the last one of the proposal, then no break will be done.
But because ti is the last page, then the signature and the section for total is output. In such a case, this section overwrite the last line.
This is why the test to know if there is enough room was done using
($heightforfooter + $heightforfreetext + $heightforsignature + $heightforinfotot)

Do yo understand what i mean. Did you test this particular case ?