Comment 2 for bug 2099678

Dont read your news in MOBI format in the calibre viewer (internally its
just one giant HTML file which will cause various issues). EPUB or AZW3
will work much better for this. The reason for the issue is that the
viewer is detecting the current article as the last one and so the toc
panel is scrolling to show the last article in bold. When all articles
are in a single file detection of article boundaries is much less
robust. As it has to work with rendered positions of HTML anchors. That
said this probably *could* be fixed, just not sure if it's worth the
effort.