Output Broken: Theme Widgets Admin Output does not validate

[hakre]

The HTML Output of widgets.php in the backend does produce a lot of errors. This is mainly because, '%i%' has been choosen as placeholder. But '%' is not a valid char in HTML IDs.

Therefore the only thing to fix this is to change the placeholder to something HTML conform. For Example '.i.'. The attached patch does fix this (and #9428).

patching %i% in widgets handling.

While testing, I run into problems adding new Widgets. Removing does work.

Replying to hakre:

While testing, I run into problems adding new Widgets. Removing does work.

my fault, this is related to #9444 which did not load in the .dev.js files. to test the patch, you must enable script debugging for the script-loader.php. To my knowledge this can only be done manually by modifying the script-loader.php file.

test done: no problems to add widgets (on wp-admin/widgets.php) with this patch.

better check if this works well with #9511

We use a different placeholder now, which should address this.