CherryPick of merge commit

[ostransky]

Hi,

I have a question, situation:

I'm in branche(B.) master and I'm trying CherryPick of commit of B. develop which is merge commit(MC.) of B. feature1 into B. develop. 
SourceTree show me this dialouge:

When  I choise as a base commit "feature1 commit 2" (which contain change in file feature1.txt) so why is in "Uncommited changes" file feaute2.txt from second parent of MC.  ? 

and oposite, when I choise "feature2" as a base  so then is in uncommited changes feature1.txt ?