FakeVim: Treat C-S-something as "not normal" in Input::is()

The problem triggering this change is that recently, C-S-s was not
handled (as "Save all") anymore when there was nothing to change,
and the keypress ended up in FakeVim. Now FakeVim filter for _exact_
C- modifier in Input::is(), letting C-S- pass as 'S-s' i.e. starting
replacement of the rest of the line.

Change-Id: I13499f5606c28fee148e410355bec7ffd6ed116a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/fakevim/fakevimhandler.cpp

@@ -893,6 +893,11 @@ static bool isOnlyControlModifier(const Qt::KeyboardModifiers &mods)
     return (mods ^ ControlModifier) == Qt::NoModifier;
 }
 
+static bool hasControlModifier(const Qt::KeyboardModifiers &mods)
+{
+    return mods.testFlag(ControlModifier);
+}
+
 
 Range::Range(int b, int e, RangeMode m)
     : beginPos(qMin(b, e)), endPos(qMax(b, e)), rangemode(m)
@@ -1065,7 +1070,7 @@ public:
 
     bool is(int c) const
     {
-        return m_xkey == c && !isControl();
+        return m_xkey == c && !hasControlModifier(m_modifiers);
     }
 
     bool isControl() const