Inconsistent title attribute in topic list

[gerhard (Gerhard Schlager)]

This is related to

Multiple tooltips on same target are confusing

Unsurprisingly, I’m not much given to trying to access tooltips. However, after our recent upgrade to latest, I was trying to check what information was being displayed in the redesigned message pages - which have no column headings - and attempted to use the tooltips. After some considerable time of carefully aiming my mouse at the number and seeing a tooltip which displays only that same number, I eventually discovered by accident that I needed to aim away from the number to get the actual i…

BTW: I think it’s weird that there is a non-existent heatmap- class applied when there are 0 replies.