What does this Visual Studio (2013 professional) magnify glass icon mean?

Question

In the bottom of my Visual Studio there is a little icon (see image)

It is a moving magnify glass (I think it's a magnify glass, I'm sure it's moving)

It's moving all the time (it's moving, in a circle shape, and the background 'block' shape is growing larger and smaller), but there is no hover text, nor can I click it...

I'm afraid of moving icons when I don't know what they do.....

Anyone know what it means/does?

EDIT:

when I click on F5, it's shown besides the VS build icon:

Answer 1

That's the predefined SBAI_Find icon in Visual Studio's Status Bar Animation Region. Any extension could be triggering it (or even Visual Studio itself). There's more information here: http://msdn.microsoft.com/es-es/library/microsoft.visualstudio.shell.interop.ivsstatusbar.animation(v=vs.100).aspx

There's no way to tell what is triggering it by your question only. To find the culprit, I'd try disabling all extensions and enabling them one-by-one.

Notice it shows when using the standard Find in Visual Studio (if you want a lengthy operation to check it, use Find In Files)