When text is entered for which the selected font doesn't have the appropriate
glyphs (in this case from the Greek and Greek Extended character sets), font
substitution is done. However, this sometimes leads to a trailing space at the
end of the line, most noticeable in two circumstances:

(1) when the cursor is at the end of the line: the cursor appears in the wrong place

(2) when the line wraps and the paragraph's alignment is "justified", the extra
space at the end of the line is especially obvious.

The defect shows up not only in screenshots but in PDFs and printing.

This behaviour shows up regardless of "Asian typography" paragraph settings, so
I guess issue 57853 is unrelated.

Attachments to follow: screenshot and odt file exhibiting incorrect behaviour,
followed by correct behaviour in a different font that has all the required glyphs.