Ignore ALT_GR when considering to hide content assists #3330
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On Linux ALT_GR is the level3 switch (at least on the US-INTL layout), when using 'include "level3(YOURKEY)"' in the xkb file. Pressing it should leave the content assist open.
I've remapped Caps-Lock as the level3 switch and changed the keyboard layout, so I can use CapsLock-h/j/k/l instead of the arrow keys. This works in all applications I use on my Gnome desktop, except for the eclipse autocomplete popups, which is quite annoying as I'm using eclipse as my main IDE for backend development.