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    $\begingroup$ Very nice! Now the sequence of evaluations is really visually clear! One thing that Trace* commands totally loose is applying the Orderless attribute. I was amazed detecting that Plus[a, 1] in really is evaluated again in the form Plus[1, a] after applying the Orderless attribute! It seems to contradict the standard evaluation sequence description. $\endgroup$ Commented Apr 3, 2011 at 7:39
  • $\begingroup$ Nifty. Now code something similar for XML... (if you have nothing better to do) :) +1. $\endgroup$ Commented Apr 3, 2011 at 10:27
  • $\begingroup$ Could you please explain why you only apply Dynamic at the end in traceView2, by substituting every dynamic with Dynamic? For performance reasons? $\endgroup$ Commented Mar 9, 2012 at 1:47
  • $\begingroup$ @IstvánZachar The dynamic substitution is unnecessary -- it is a leftover piece of code from a previous version of the function. It could even be considered harmful as it is preferable to defer the creation of the inner OpenerViews. I'd fix it, but I notice that these functions now perform very poorly for complex traces in versions of Mathematica released since I wrote this response. It seems that some relevant performance characteristic changed in a later microrevision of V7 (possibly V7.0.1). These functions need to be revisited (but I cannot do that right at the moment). $\endgroup$ Commented Mar 10, 2012 at 18:36
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    $\begingroup$ Why don't you put this code on GitHub? Right now people may be copying this code from here, and modifying it for their personal use. But the improvements never make it back here for the whole community's benefit. GitHub would encourage people to either contribute the changes back, or at least would make it easier to track down modified version. Why GitHub and not another site? Because GitHub allows people to edit the source in a browser without even needing to install git. This can actually work with short functions like this. $\endgroup$ Commented Mar 5, 2013 at 18:29