[TYPO3-core] RFC: #9320: Bugfix for temporary Filemounts

[Steffen Kamper]

Hi

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=9320

Branches: trunk, 4.2

Description:
This belongs to the element browser using temporary filemounts added with
options.folderTree.altElementBrowserMountPoints

The current situation has some bugs

* the whole tree is set to "readonly" so user has no possibility to 
upload files to his regular filemount
* mounts have wrong icon (ftp_user-icon) because the filemounts are 
initialized with wrong parameter

The attached patch corrects this with
* remove readonly-flag
* adding a new mount-type "readonly" for temporary filemounts
* add a new icon for readonly-filemount
* use mount type while render subfolders and use readonly-icon for 
subfolders of temporary mount (see screenshot readonly.png)
* in element browser determine the current mount and remove upload 
possibility if mount is readonly

The patch works for all element browsers (normal, RTE, DAM)

Additional Information:
There are 2 new icons for the readonly-mounts (attached)
* _icon_ftp_readonly.gif => typo3/gfx/i/_icon_ftp_readonly.gif
* [t3skin]_icon_ftp_readonly.gif => 
typo3/sysext/t3skin/icons/gfx/i/_icon_ftp_readonly.gif
  	
Thanks Stan as this patch is created by teamwork of Stan and me.

vg Steffen
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