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fix: correctly show conflicts in extension manager

fix: check if key is set to fix PHP Notice

If a key is not set, a PHP Notice is triggered. While these are
currently suppressed, this is still a code smell.

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slightly adjusted the icon sizes

This looks a bit better and is closer to the original, even though the
sizes are a bit weird now.

readd significant space

this got lost in a previous update

fix(config): empty string is valid for numericopt

There was a bug that the empty string was considered to be invalid if
also a max or min value was defined for a config field of type
numericopt.

do not create unecessary references for single use objects

Removed progressbar from searchform

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Make default encapsulation more readable and less duplicate.

Replace htmlspecialchars to hsc in core

Add the preview-bool for the cache file.

#2021 broken links to W3C validators
also dokuwiki and php are on https

extracted functions
added test coverage

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could b

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could be refactored into nicer code once we move to
PHP 7 and get access to the `??` operator.

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allow tests against ajax requests

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clean extension names. fixes #2042

This makes sure the provided extension ID is a valid id before
initializing it in the extension manager.

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