I have been using Ubuntu 17.10 for a while and is working great. But today after the update, I have a new shortcut, Alt+Shift, as an alternative Switch to the next input source. Alt+Shift is a common modifier in Intellij so a lot of shortcuts doesn't work any more.
I tried to change the shortcut but it is not listed in the shortcuts window.
Is there a file where I can change it (the alternative)?
Here is the screenshot of the option