Can not save images with WYSIWYG editor if more than two 2 spaces are present page name

This issue is the same as XWIKI-2583 in the case there is more than one space in the name of the page or the space.

To reproduce it :

• create a new page with the name "My favorite pages" that has 2 spaces in its name
• edit this page with the wysiwyg editor to add a photo
• when you save, the photo has disappeared from the page.

I have found a correction to this by analyzing the correction of the JIRA 2583.
Here it is :
In attachment.js, replace the line :

var imgname_reg = new RegExp(this.getImagePath().replace('+', '\\+') + "(.*)", "i");

by the following line :

var imgname_reg = new RegExp(this.getImagePath().replace(/\+/g, '\\+') + "(.*)", "i");