Unwanted newlines being added to output.

Bắt đầu với reproducer Python được cung cấp và theo dõi cách tomlkit serialize các bảng sau khi các bảng lồng nhau được thêm vào. So sánh các đầu ra round-trip và đã thay đổi, sau đó thêm một regression test bao quát hành vi newline; hoàn tất khi khoảng cách giữa các bảng tuân theo cấu trúc được tạo rõ ràng mà không có thêm newline ngoài dự kiến.

I want to group my tables:

[first]
foo = 5
bar = 20
[first.a.b.c]
alice = 10
bob = 30

[second]       
foo = 3
bar = 21
[second.a.b.c]
alice = 15
bob = 3543

When I try to manually construct this, I instead get

[first]
foo = 5
bar = 20

[first.a.b.c]
alice = 10
bob = 30


[second]       
foo = 3
bar = 21

[second.a.b.c]
alice = 15
bob = 3543

I expected no newlines to be added for me and explicitly called out a newline between [first.a.b.c] table and [second]. Newlines being added surprised me and made made me wonder if tomlkit was properly preserving the lack of newlines but it seems to.

So I created the following test case to experiment with how newlines are dealt with

import tomlkit

t = tomlkit.loads("""[first]
foo = 5
bar = 20
[first.a.b.c]
alice = 10
bob = 30
[second]
foo = 3
bar = 21
[second.a.b.c]
alice = 15
bob = 3543""")

print("Round-trip")
print("```toml")
print(tomlkit.dumps(t))
print("```")
print()

t["second"].add("extra", tomlkit.table())
t["second"].add("extra1", tomlkit.table())
three = tomlkit.table()
three["foo"] = 2
three["bar"] = 1
child = tomlkit.table()
child["alice"] = 3
child["bob"] = 10
three["child"] = child
t["three"] = three


print("Changed")
print("```toml")
print(tomlkit.dumps(t))
print("```")
print()

The output is:
Round-trip

[first]
foo = 5
bar = 20
[first.a.b.c]
alice = 10
bob = 30
[second]
foo = 3
bar = 21
[second.a.b.c]
alice = 15
bob = 3543

Changed

[first]
foo = 5
bar = 20
[first.a.b.c]
alice = 10
bob = 30
[second]
foo = 3
bar = 21
[second.a.b.c]
alice = 15
bob = 3543
[second.extra]

[second.extra1]

[three]
foo = 2
bar = 1

[three.child]
alice = 3
bob = 10

I was surprised that second.extra didn't have a newline before it but second.extra1 did. I imagine this just shows how the newlines are being auto-added but it is still surprising.