The red marker shows that there are overdue tasks.
https://github.com/abstractspoon/ToDoList_Downloads/tree/master/Dictionaries
But at the moment I have one TDL-file with red marker, but there are no red tasks ....???
The two circles shows that the file content is not loaded yet.
The asterix ;-) shows that the file is changed.
> The meaning of the icons is summarised in the tooltip that appears when you hover your mouse over each tab,
?? The only tooltip I get is „File not loaded“. It appears at every position the mouse have when hovering above the tab. There is no other tooltip for overdue / close / ...