Diff filler missing for added lines at bottom of file comparison
Official development repository for Vim's builtin TOhtml plugin
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Seen in 8.2.1944, if the right file in a diff adds new lines to the end of the file compared to the left file (and possibly relevant, last shared line has differences), then the diff filler is not added to the left file in the generated HTML.
Note: investigation shows it happens any time there are new lines at the end of the file. It doesn't matter if the last line has changed. It also doesn't matter which side of the diff has the new lines.
Fixed in https://sourceforge.net/p/vim-tohtml/code/ci/9cc72cb8d8e3/ and tests added in https://sourceforge.net/p/vim-tohtml/code/ci/e34d00fa1368842d765d0bdc1619ac6753b4361d/