implement Upload Dialog in Editor via fileAPI + Mediawiki API

[jdittrich]

Users expect the image-dialog in the editor to contain a upload-facility (as seen in Usability tests) probably since this is known from Wordpress, Facebook etc.
Such a dialog might be implemented using the WikiEditor extensions structure, the use of the file API and Mediawiki's upload API

Upload Itself

• Stashing principles
• Stashing in actual upload

UI

• on D'n'D of a file, automatically switch to/trigger upload part
• Implement basic dialog structure
• Implement Wizard behaviour
• Collapsible Tree Structure for space saving overview of licenses
• Basic form validation
• Disable "Insert" when being in the upload-wizard
• Disable "back" after finished upload
• explain licenses results (Users will NOT know what the licenses are!)

sanity-checks

• check if user is logged in, don't display recent and upload than
• check if image is uploaded already (Done by the upload wizard by pseudo-chunked uploading, using the stach-area)
• File Error Handling
• Check if the Browser supports FileAPI etc. (Many still use IE8,9 and Safari5.1)

RELATED: specific fix showing recent uplaods: #14, uploading-usability: #10, editing-Usability:

[jdittrich]

We should use the dialog (if javascript is on) for normal uploads as well since the upload form is hard to customize: it only allow text on the top (bad mapping).