Could someone help me by explaining how this is formed?
The question here refers to an answer to my question (second comment on answer), but I don't understand it: Could someone help with the gramatical construction of this phrase?
Answer (3-㋒): https://dictionary.goo.ne.jp/jn/120514/meaning/m0u/
It looks like someone transformed a masu-form verb to a "masu-te"-form, which I never heared of:
する、します、しまして
たべる、たべます、たべまして
If I am not mistaken, the referenced answer also talks about the potential form. How does this relate? Furthermore, is this construction in any way related to はじめまして?