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Styling pageutils.php

handle hashes in page_exists. fixes #3608

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add fallback when url parameter rev is current

feed.php request to show page or media diff previous with current by url parameter rev that is current revision number.

abort XMLRPC later in serve()

Fix #3619 and correctly handle exceptions in XMLRPC

This ensures that any exception happening during XMLRPC processing is
signalled correctly to the client as XML encoded error message.

Accept returnonly parameter to header()

Ignore missing event system in logging #3614

change var name $Rev to $RevInfo

change var name $rev1Supple to $rev1Summary

correctly (re)cache modified images

The previous code used to cache the result of resize and crop image
operations indefinitely. They only time these caches were refreshed were
when the original sou

correctly (re)cache modified images

The previous code used to cache the result of resize and crop image
operations indefinitely. They only time these caches were refreshed were
when the original source changed.

This meant that changes in configuration (eg. the image quality setting)
were never applied to existing images, neither were changes/improvements
in the resizing code.

This patch introduces a new Cache class for these kind of modification
results.

It also removes more duplicated code in media_resize_image and
media_crop_image. Future refactorings may move this code into
File\MediaFile

This code should also fix currently weird results for plugin and
screenshot in the extension manager - TBH I am not 100% sure what
happened there but refreshing the cache once seems to solve the problem.

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revert to simple boolean result when creating user, phpcs fix

Reverted change

fix annotation

Create one user per request

Implements #3606: add xmlrpc createUsers function

no link to attic if no version in attic

moved global

some spelling

use RevisionInfo class more in Diff

use RevisionInfo Rev1, Rev2 instead of array oldRevInfo, newRevInfo
obsolete revisionTitle(), use RevisionInfo::showRevisionTitle()
change variable names

use OOP like method name in RevisionInfo class

fix typo