coding style: control flow whitespaces

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Form

Support the multiple attribute in Form selects

This should fix a problem mentioned in
https://github.com/splitbrain/dokuwiki-plugin-data/pull/229#issuecomment-1196367602

Note that prefilling from $

Support the multiple attribute in Form selects

This should fix a problem mentioned in
https://github.com/splitbrain/dokuwiki-plugin-data/pull/229#issuecomment-1196367602

Note that prefilling from $INPUT is still only supported for single
value selects.

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PSR-12 coding style

line lengths shortened

This makes sure all files use line lenghts shorter than 120 characters.

This is a quick fix. It might not always be the nicest change.

Fix strict warnings in optgroups/dropdowns

PHP 5.6 and below throw a strict standards warning at the changed lines.
An intermediate variable is introduced to avoid this warning.

PHP 7+ changes the

Fix strict warnings in optgroups/dropdowns

PHP 5.6 and below throw a strict standards warning at the changed lines.
An intermediate variable is introduced to avoid this warning.

PHP 7+ changes the severity of this warning to E_NOTICE which is
suppressed by DokuWiki.

This error was introduced in #1778

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refactor: handle default options w/ other optgroups

refactor: Rename method to better convey its purpose

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sens

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sensible to make an extra commit for that.

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fix: Make this Form method chainable as it should be

fix: ensure that there is only 1 selected option

Multiple selected option would not be valid HTML.

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicat

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicate code, I've to move the handling of
options to the OptGroup-Class completely.

Known Issues:
-------------
* We may have more than one option with the same value and therefore
more than one option may be marked as selected.

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Remove type-attr from <select> b/c it's invalid

fixes #1776

Fix resetting select-options attributes

Escape option-attributes and fix typo

Make select-options in Form more configurable

Now classes and data- attributes can be added to individual options

added dropdown type to new Form system #1312