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08d840bfbe
This PR adds a mechanism to hide groups but have their options visible
as part of the parent.
This works for option group names starting with a '+'
for example
```
CLI::App app;
bool flag = false;
std::optional<bool> optional_flag = std::nullopt;
app.add_option("--tester");
auto *m1=app.add_option_group("+tester");
m1->add_option("--flag", flag, "description");
m1->add_option("--optional_flag", optional_flag, "description");
CLI11_PARSE(app,argc, argv);
```
will produce help as
```txt
Options:
-h,--help Print this help message and exit
--tester
--flag BOOLEAN description
--optional_flag BOOLEAN description
```
instead of
```
Options:
-h,--help Print this help message and exit
--tester
[Option Group: tester]
Options:
--flag BOOLEAN description
--optional_flag BOOLEAN description
```
Fixes issue #1034 and a few other past issues or questions
---------
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>