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Removes the need to explicitly avoid exporting the classes symbols &
creates consistency with Qt code

See also https://phabricator.kde.org/T13924

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In C++20 there are new classes that have member functions named emit().
c.f.:
https://lists.qt-project.org/pipermail/development/2020-February/038812.html
https://en.cppreference.com/w/cpp/io/basic_osyncstream/emit

GIT_SILENT

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In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

NO_CHANGELOG

NO_CHANGELOG

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

This triggers change notifiers which can have unintended consequences

Example code that was breaking: mai when asking the name in Catalan

The translation for mai in Catalan is Maithili, same as in English, so we were falling back to QLocale, but sadly QLocale(mai) returns "i don't know what this is" so we were returning QString() instead of returning "Maithili"

This adds just some @par headings in the KConfigDialogManager
class documentation, so information is a bit easier to look up quickly.

The QScrollArea, wich is used for wrapping pages, does not include
scrollbars in its sizeHint(). This checks whether the QScrollArea
uses the page’s horizontal size and a smaller vertical size as size
hint, and in that case sets the minimum horizontal size to include
the vertical scrollbar.