further work on rich hover vs. hover eval vs. ctx menu arrangements; it's a bit too noisy/annoying when hover eval for breakpoints/threads/etc. is just turned on all the time, and now that we have the ability to hover-eval-style query views, because of tabs, we can just do that with breakpoints etc. too. the old rich hover tooltips / highlights / etc. can then just be used normally. also put in some mechanisms to block rich hover tooltips when it is strictly redundant information.

src/eval_visualization/eval_visualization_core.c

@@ -1117,6 +1117,7 @@ internal B32
 ev_row_is_expandable(EV_Row *row)
 {
   B32 result = 0;
+  if(!ev_key_match(ev_key_root(), row->block->key))
   {
     Temp scratch = scratch_begin(0, 0);
     E_IRTreeAndType irtree = e_irtree_and_type_from_expr(scratch.arena, row->expr);