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Trouble shooting: Shift + Alt hijacked on Emacs by some keyboard interceptional function

I have been using MATE desktop environment on my laptop PC since my installation of Debian Jessie.

Shortly, I noticed that Emacs M-< and M-> wouldn't work. Since then, I have managed to use the Emacs using ESC key instead of the Alt key as the Meta key.

After one year of inconvenient use, I finally find what intercepts the Shift - Alt key. It is keyboard layout switching function of MATE.

Here is the screenshot of its setting panel:



My next question: Are MATE users happy with this default setting?



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