Export of internal Abseil changes

--
00c451dc81be7fe05f982b08b4ea1edc2ca2c1c5 by Abseil Team <absl-team@google.com>:

remove a test that is currently broken on emscripten from running on
emscripten.

PiperOrigin-RevId: 262005667

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9df5f5acb65996bdb99900039a4f01a44811aa14 by CJ Johnson <johnsoncj@google.com>:

Adds a layer of macro-indirection to opening up namespace absl inside a macro. This helps avoid an issue identified with the LTS inline namespaces

PiperOrigin-RevId: 261990937

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5d40aa129cd77a1b853e5389aff7eacffe5c8204 by Gennadiy Rozental <rogeeff@google.com>:

Fix handling of new lines in flag help descriptions.

If there are explicit new lines in a flag help description string,
we respect it and format the usage message accordingly.

PiperOrigin-RevId: 261974244

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4997b5a2ddb983969059470a2d2bc2416b3d785e by CJ Johnson <johnsoncj@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 261955031
GitOrigin-RevId: 00c451dc81be7fe05f982b08b4ea1edc2ca2c1c5
Change-Id: I5a13bfb15bba0f7b6e49c0655c57c3addfeb1c72

1 files changed, 16 insertions, 2 deletions

diff --git a/absl/flags/internal/usage.cc b/absl/flags/internal/usage.cc
index aac02db6c27a..03048514ae0b 100644
--- a/absl/flags/internal/usage.cc
+++ b/absl/flags/internal/usage.cc
@@ -111,8 +111,16 @@ class FlagHelpPrettyPrinter {
 
     std::vector<absl::string_view> tokens;
     if (wrap_line) {
-      tokens = absl::StrSplit(str, absl::ByAnyChar(" \f\n\r\t\v"),
-                              absl::SkipEmpty());
+      for (auto line : absl::StrSplit(str, absl::ByAnyChar("\n\r"))) {
+        if (!tokens.empty()) {
+          // Keep line separators in the input std::string.
+          tokens.push_back("\n");
+        }
+        for (auto token :
+             absl::StrSplit(line, absl::ByAnyChar(" \t"), absl::SkipEmpty())) {
+          tokens.push_back(token);
+        }
+      }
     } else {
       tokens.push_back(str);
     }
@@ -120,6 +128,12 @@ class FlagHelpPrettyPrinter {
     for (auto token : tokens) {
       bool new_line = (line_len_ == 0);
 
+      // Respect line separators in the input std::string.
+      if (token == "\n") {
+        EndLine();
+        continue;
+      }
+
       // Write the token, ending the std::string first if necessary/possible.
       if (!new_line && (line_len_ + token.size() >= max_line_len_)) {
         EndLine();