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Finding One participant had the Watches window selected when he invoked the first expression step. Therefore he couldn't see the node even if it was displayed in Local Variables, which it wasn't ;-). Participant then clicked into the Local Variables tab. Severity This might be a potential problem with discoverability of how the expression stepping works. Recommendation Consider showing the sub-expression node also in Watches window (probably not a good idea). Or show the expression result tooltips automatically, which would point users attention away from sub- expression node, but maybe that's okay.
I do not think it would be good to show sub-expression results in the Watches window; this window is empty until the user adds an expression there and it is its purpose. I believe that after #90143 and #90155 are implemented (we will try for NB 6), sub-expression discoverability will be much better and hopefully sufficient. After we have some wider feedback, we may consider showing tooltips automatically -> RFE P3