Specific use of してまで


Recently I've been reading Michael Emmerich's "New Penguin Parallel Text" for
Japanese short stories. In Yoshimoto Banana's "A Little Darkness," there's a
passage that describes how the narrator's father didn't like planned birthday
celebrations (he avoids them and gets dead drunk), to the point where the
mother and daughter surprise him with a middle of the night birthday party
while he's sleeping, and so in this case he comes home, not drunk, like a
nice, regular day. At that point, Yoshimoto writes:

> そんなにしてまで、とは思わなかった。

In Emmerich's translation, the passage goes: "It never occurred to us that if
we had to go to so much trouble, we might as well not celebrate."

In [this thread](https://japanese.stackexchange.com/questions/29101/meaning-
of-verb-%E3%81%A6%E3%81%BE%E3%81%A7), a seemingly similar use of `-てまで` has a
meaning of weighing the worth of one's actions. Is that what is going on here,
but the portion "we might as well not celebrate" is merely implied in the
Japanese, and made explicit in the translation? If so, how can we reach that
conclusion based on this short and seemingly simple phrase?

Is it common to drop that secondary clause? Or is this a sort of stock phrase?
I'm having trouble understanding the leap here.

Here's the full passage for context:

>
> 誕生日の前夜には父が寝静まってからこっそりと支度をして、プレゼントをテーブルに並べて、音もなく調理をして、夜中の二時に父を叩き起こし、みんなでパジャマを着たまま乾杯をしたこともあった。そういう時、その創意工夫に父は本当に救われたと思う。そして、誕生日当日は寝ぼけて会社に行き、普通に帰ってきて、普通の夕食を食べていた。そんなにしてまで、とは思わなかった。それが愛情の示し方であったり、人間の弱さというものだと思った。




そんなにしてまで、とは思わなかった (sonna ni shite made, to wa omowanakatta) means "I never
thought (someone) would go to such lengths." It is used to express surprise or
amazement at the effort or dedication someone has put into something.

In this context, the speaker is recalling a memory of their father being woken
up in the middle of the night to celebrate their birthday in their pajamas,
and how much effort their father put into making the celebration special. The
speaker reflects on how this demonstration of love and effort truly helped
their father, and how they never would have thought their father would go to
such lengths. They also reflect on how this shows the weakness of humans and
the ways they show love.

