Fixed handling of a dead key followed by space on win32 and X11.

A dead key followed by space should convert the dead key to a
regular character.

lib/platform/CMSWindowsSecondaryScreen.cpp

@@ -127,8 +127,8 @@ CMSWindowsSecondaryScreen::keyDown(KeyID key,
 	// generate key events
 	doKeystrokes(keys, 1);
 
-	// do not record button down if button is 0 (invalid)
+	// do not record button down if button or virtual key is 0 (invalid)
-	if (button != 0) {
+	if (button != 0 && virtualKey != 0) {
 		// note that key is now down
 		m_serverKeyMap[button]      = virtualKey;
 		m_keys[virtualKey]         |= 0x80;
@@ -956,6 +956,33 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
 	virtualKey = mapCharacter(keys, multiByte[0], hkl, m_mask, mask, action);
 	if (virtualKey != static_cast<UINT>(-1)) {
 		LOG((CLOG_DEBUG2 "KeyID 0x%08x maps to character %u", id, (unsigned char)multiByte[0]));
+		if ((MapVirtualKey(virtualKey, 2) & 0x80000000u) != 0) {
+			// it looks like this character is a dead key but
+			// MapVirtualKey() will claim it's a dead key even if it's
+			// not (though i don't think it ever claims it's not when
+			// it is).  we need a backup test to ensure that this is
+			// really a dead key.  we could use ToAscii() for this but
+			// that keeps state and it's a hassle to restore that state.
+			// OemKeyScan() appears to do the trick.  if the character
+			// cannot be generated with a single keystroke then it
+			// returns 0xffffffff.
+			if (OemKeyScan(multiByte[0]) != 0xffffffffu) {
+				// character mapped to a dead key but we want the
+				// character for real so send a space key afterwards.
+				LOG((CLOG_DEBUG2 "character mapped to dead key"));
+				Keystroke keystroke;
+				keystroke.m_virtualKey = VK_SPACE;
+				keystroke.m_press      = true;
+				keystroke.m_repeat     = false;
+				keys.push_back(keystroke);
+				keystroke.m_press      = false;
+				keys.push_back(keystroke);
+
+				// ignore the release of this key since we already
+				// handled it in mapCharacter().
+				virtualKey = 0;
+			}
+		}
 		return m_mask;
 	}
 	nChars = MultiByteToWideChar(codePage,
@@ -1240,6 +1267,15 @@ CMSWindowsSecondaryScreen::mapToKeystrokes(Keystrokes& keys,
 		break;
 	}
 
+	// if this is a dead key press then send a release immediately.
+	// the dead key may not be processed correctly if its release
+	// event comes after we release the modifiers.
+	if (action == kPress &&
+		(MapVirtualKey(virtualKey, 2) & 0x80000000lu) != 0) {
+		keystroke.m_press = false;
+		keys.push_back(keystroke);
+	}
+
 	// add key events to restore the modifier state.  apply events in
 	// the reverse order that they're stored in undo.
 	while (!undo.empty()) {

lib/platform/CXWindowsSecondaryScreen.cpp

@@ -1829,6 +1829,19 @@ const CXWindowsSecondaryScreen::KeySymsMap&
 CXWindowsSecondaryScreen::getDecomposedKeySymTable()
 {
 	static const KeySym s_rawTable[] = {
+		// non-dead version of dead keys
+		XK_grave,        XK_dead_grave,       XK_space, 0,
+		XK_acute,        XK_dead_acute,       XK_space, 0,
+		XK_asciicircum,  XK_dead_circumflex,  XK_space, 0,
+		XK_asciitilde,   XK_dead_tilde,       XK_space, 0,
+		XK_cedilla,      XK_dead_cedilla,     XK_space, 0,
+		XK_ogonek,       XK_dead_ogonek,      XK_space, 0,
+		XK_caron,        XK_dead_caron,       XK_space, 0,
+		XK_abovedot,     XK_dead_abovedot,    XK_space, 0,
+		XK_doubleacute,  XK_dead_doubleacute, XK_space, 0,
+		XK_breve,        XK_dead_breve,       XK_space, 0,
+		XK_macron,       XK_dead_macron,      XK_space, 0,
+
 		// Latin-1 (ISO 8859-1)
 		XK_Agrave,       XK_dead_grave,       XK_A, 0,
 		XK_Aacute,       XK_dead_acute,       XK_A, 0,