Make 'uncomment' for XML and HTML work, and be compatible with Visual Studio

Description of the Issue

When uncommenting a line in an XML file (or HTML) file using Ctrl+Shift+K, it doesn't work if the line was commented in Visual Studio, and not Notepad++, in certain cases based on text being commented.

Steps to Reproduce the Issue

1. Create an XML file that looks something like this:
   <system.web>
</system.web>

2. Put the cursor on either line (say the first line). As long as the line ends with a >

3. Hit Ctrl+K to comment it. The line changes to:
   <!-- <system.web> -->

Note the space after the <!-- and before the -->. Remove those spaces so the line looks like this:
<!--<system.web>-->
This is the way Visual Studio would have comment the line (using their Ctrl+K,Ctrl+C keystrokes)

Now try to uncomment it in Notepad++ using Ctrl+Shift+K

Expected Behavior

It won't uncomment.

Actual Behavior

It will uncomment -- just like Visual Studio does using their Ctrl+K,Ctrl+U keystrokes.

Debug Information

If you change this:
<!--<system.web>-->
to this:
<!--<system.web> -->
by adding a space before the -->, then Ctrl+Shift+K works.

Reproduce Ctrl+Shift+K on XML and HTML comments in both Notepad++ and Visual Studio styles, especially comments without spaces around the content. Trace the editor's uncomment command and compare behavior for the two comment forms; done means both forms are uncommented correctly.