lRespublica left a comment (rpm-software-management/rpm#3663)
Yes, `\` was removed as a side effect of multi-line macros.
The example above demonstrates a situation where logical indentation is
necessary to improve readability, but %{expand:} cannot be used.
The primary function of %{trim: } is to remove trailing and leading whitespace
from each line within its body. I was guided by %{shrink: ...} in the
implementation. However, unlike %{shrink: ...}, it does not remove line breaks
and preserves the whitespace structure within each line.
How it works
Next expression
<details><summary>Before</summary>
```
%define test_expand1 %{expand: A lot
of
}
%define test_expand2 %{expand: trailing
whitespaces }
%define test_trim %{trim:
%test_expand1
%test_expand2
}
%test_trim
```
</details>
After applying of 'trim' will be expanded to
<details><summary>After</summary>
```
A lot
of
trailing
whitespaces
```
</details>
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