https://www.emacswiki.org/emacs/DebuggingWithEmacs has a good solution for highlighting current line when debugging.
What it looks like:
Neat! I’m hoping that it can be installed in Emacs core. And there was already a discussion https://lists.gnu.org/archive/html/help-gnu-emacs/2013-02/msg00056.html in
2013.
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Zhiwei Chen