[PATCH] add .git-blame-ignore-revs

white-space and typo fixes can affect the usability of git blame. i feel
like sometimes people avoid fixing obvious formatting problems because
they're worried about this

since git 2.23 you can tell blame to ignore these noisy commits using
--ignore-revs-file / blame.ignoreRevsFile. all major forges activate
this functionality automatically when blaming in the web ui if the file
.git-blame-ignore-revs exists. for example this is github's
documentation on it:

https://docs.github.com/en/repositories/working-with-files/using-files/viewing-and-understanding-files#ignore-commits-in-the-blame-view

here's a file like that for zsh. i've pre-populated it with some
previous white-space commits, but i didn't look super hard for them. i'm
mostly posting this to advertise its availability for future changes.
i'd like to eventually use it to fix some white-space issues that've
been bothering me. but more immediately maybe we'd want it for w/54806

dana


diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 000000000..820c77fa0
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,26 @@
+# commits to be ignored by git blame. use as follows:
+#
+#   git config blame.ignoreRevsFile .git-blame-ignore-revs
+#
+# .git-blame-ignore-revs is the conventional file name for this purpose, so you
+# may prefer to use it globally instead. this is possible in git 2.53+:
+#
+#   git config --global blame.ignoreRevsFile ':(optional).git-blame-ignore-revs'
+#
+# in general, only trivial, non-functionality-affecting commits (e.g. typo and
+# white-space fixes) should be added to this list
+#
+# please add in ascending chronological order
+
+# unposted: Fix inconsistent white space in change log
+92b0e885d6273315602668eb50f25310020fee13
+# unposted: fix indentation (whitespace-only change)
+6c6200520afa0409c5c310cd421f33353c44c61d
+# 45101: Adjust white space
+1a8c69e26fc7e64e1b5e2837d7754a910b6a0c26
+# Clean up error-message white space
+4ce66857b71b40a0661df3780ff557f2b0f4cb13
+# 46139: _git: Remove hanging whitespaces
+d839833e4e00ee320a353846eaa235ab952181f0
+# 49435: Remove trailing whitespaces in expn.yo
+02f75cf38699b99340c1d2c8f5a9d9aaf81432e7