Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`, now with "east const" enforcement.
Use `clang-format` version 18.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Issue: #26123
Since these changes:
* commit f1de6f6682 (cmake-gui: Support building against Qt6,
2020-12-17, v3.20.0-rc1~205^2~7)
* commit 134d69121e (cmake-gui: Restore search bar for cache view and
environment dialog, 2021-02-22, v3.20.0-rc2~12^2)
the search bar is no longer case insensitive when using Qt 5.12.[0-1],
and possibly some later versions. It works as of Qt 5.15 though, so
update our version check accordingly.
Fixes: #21884
Don't use subclasses to connect to QAbstractButton::clicked. This is
slightly dodgy, but of more immediate importance, tweaking it will allow
us to change the widget type of some QToolButton instances that should
be QPushButton.
