QKeyEvent::key() returns same for key W and S on Greek kbd

// Let's say that these QKeyEvents are respectively
// an event triggered by a Greek keyboard pressing
// the W key and the S key (without any modifiers)
QKeyEvent *w, *s;

// Then we convert the key to a QKeySequence (we said
// here above that there were no modifiers, so we are
// not keeping out any info in this particular case by
// only looking at QKeyEvent::key())
QKeySequence keyseq_w = QKeySequence(w->key());
QKeySequence keyseq_s = QKeySequence(s->key());

// Although two physically different keys were pressed,
// QKeyEvent::key() returns 931 for both the W key as
// the S key.
//
// This has to do with the fact that both keys are
// holding sigma...
// W => ς, Σ (lower-case in word-final positin, upper-case)
// S => σ, Σ (lower-case, upper-case)
// See wiki on Sigma: https://en.wikipedia.org/wiki/Sigma
//
// ... and that QKeyEvent::key() does not distinguish
// between capital and non-capital letters.
// See documentation: http://doc.qt.io/qt-4.8/qkeyevent.html#key
w->key() == s->key(); // True (see comment for why this is true)

// True because both are constructed with the same key
// code (931) and thus are identical QKeySequences
keyseq_w == keyseq_s;