cubicweb #4383922 .commit() is a (silent) noop if called from a .postcommit event [validation pending]

And there is no sound reason for this.

prioritynormal
typebug
done in3.19.6
load0.200
load left0.000
closed by#dab538127d72 [session] don't silently ignore commits
patch[session] don't silently ignore commits [applied]