[TYPO3-core] RFC #7984: Bug: stdWrap.crop now closes opened tags and counts chars correctly

[Jochen Rau]

This is an SVN patch request.

Type: Bugfix

Bugtracker references: http://bugs.typo3.org/view.php?id=7984

Branches: TYPO3_4-1, TYPO3_4-2 and trunk

Problems:
1) After stdWrap.crop has cropped text opened tags are not closed. This 
leads to unvalid HTML-code and strange FE-rendering.
2) stdWrap.crop counts chars of tags in text. This leads to shorter 
visible cropped text in FE.
3) stdWrap.crop counts chars of HTML-entities instead of the represented 
char (see 2)).

Solution:
In the proposed solution the content is splitted into an array. This 
array is parsed and each openen tag gets closed. Tags are not counted 
and HTML-entities are decoded before strlen is determined.

Notes:
In the proposed solution cropping at the last white space (to avoid 
broken words) can not "slide" over a tag.

Greetings
Jochen Rau
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