Textures mouseover.highlight spacer

[rulezyx]

Hello,

I was pretty much looking up all WoW Textures but I couldn't find the help/blue-highlight which appears with mouseover on talents.

Example

There are many similar textures and I checked all of them (at least I think so).

When I checked with a clean (default) UI its still the same two blue borders and no button or talent/highlight textures are involved.

Basically I want to disable/hide it.

It looks bad even when in theory it should help people to navigate.

I also have similar issue with the spacer between the MailFrames and its paper.

Example
Example

I replaced all paper/background and inset-textures but these seem to stay.

Blizzard-Code

I used the Texture-Mirror on Github and TAV also looking up fstacks.

If someone already dealed with similar issues or knows how to fix this I really appreciate any help