hgview #79263 fancier graph highlighting for tui [validation pending]

The goal is to highlight only the node in the graph instead of the whole graphline.

prioritynormal
typeenhancement
done in1.5.0
load0.200
load left0.000
closed by#f2cc8e2ff806 [curses] fancier graph highlighting for current/working changeset (closes #79263)