another try to fix when github actions run

The attempt in 7bbf38eeb4aaf5ac1c3b4a2cea4cc0b371890f4a to not run
checks twice for our own internal pull requests seem not to have worked,
because checks

another try to fix when github actions run

The attempt in 7bbf38eeb4aaf5ac1c3b4a2cea4cc0b371890f4a to not run
checks twice for our own internal pull requests seem not to have worked,
because checks in external PRs were no longer executed.

This is another approach to achieve the same based on code found at
https://github.com/Dart-Code/Dart-Code/blob/764f121f9abe5f4496528d35277946d4130af93d/.github/workflows/build-and-test.yml#L10-L12

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do not repeat successful security checks. fixes #3363

This avoids creating lots of 403 errors for properly secured data
directories. Only one successful check per browser session will be
executed.

lazy load images

This adds the loading="lazy" attribute to embedded images and the
thumbnails in the media manager. This instructs modern broswers to load
images on demand when they come into view.

lazy load images

This adds the loading="lazy" attribute to embedded images and the
thumbnails in the media manager. This instructs modern broswers to load
images on demand when they come into view. It can reduce used bandwith
and improve perceived speed.

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fix style problem

minor cleanup in AdminAction

removed unecessary method, added doc blocks

allow to instantiate Ui\MediaDiff('')

fix usage get_doku_pref()

var type of $oldRev and $newRev

remove last_rev property

bugfix in media Ui classes

bugfix page id "0" is valid

fix typo

Log opcache invalidation failure to debug log

abstract method itemFN()

fix phpdoc for deprecated functinos

check media id validity

fix variable declaration

rename variables

remove Ui\Diff::buildDiffHead()

refactor Diff with extendedRevisionInfo()

obsolete buildDiffHead()

Suppress error in opcache_invalidate() call

translation update

define Ui\Revisions::getRevisions()

- new item property defined
- modified getObjRevInfo(), buildDiffHead()

translation update

allow instance when id is not identical with $INFO['id']