[sugar] [PATCH] Add is_modifier and is_special_modifier functions to SugarKeyGrabber.

[Benjamin Berg]

This commit adds two new functions to SugarKeyGrabber that allow to check
whether a modifier key has been pressed or released. This is needed to stop
tabbing when <Alt> is released again.
---
 src/sugar/_sugarext.defs      |   19 +++++++++++++
 src/sugar/sugar-key-grabber.c |   59 +++++++++++++++++++++++++++++++++++++++++
 src/sugar/sugar-key-grabber.h |    6 ++++
 3 files changed, 84 insertions(+), 0 deletions(-)
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