Windows: Mapped VK_SNAPSHOT to KEY_SYSRQ and added workaround to a windows bug where WM_KEYDOWN is never generated for VK_SNAPSHOT

src/java/org/lwjgl/opengl/WindowsDisplay.java

@@ -706,7 +706,17 @@ final class WindowsDisplay implements DisplayImplementation {
 				return true;
 			case WM_SYSKEYDOWN: /* Fall through */
 			case WM_SYSKEYUP: /* Fall through */
-			case WM_KEYUP: /* Fall through */
+			case WM_KEYUP:
+				// SysRq apparently only generates WM_KEYUP, so we'll fake a WM_KEYDOWN
+				if (wParam == WindowsKeycodes.VK_SNAPSHOT && keyboard != null &&
+						!keyboard.isKeyDown(org.lwjgl.input.Keyboard.KEY_SYSRQ)) {
+					// Set key state to pressed
+					long fake_lparam = lParam & ~(1 << 31);
+					// Set key previous state to released
+					fake_lparam = fake_lparam & ~(1 << 30);
+					handleKeyButton(wParam, fake_lparam, millis);
+				}
+				/* Fall through */
 			case WM_KEYDOWN:
 				handleKeyButton(wParam, lParam, millis);
 				return false;

src/java/org/lwjgl/opengl/WindowsKeyboard.java

@@ -74,6 +74,10 @@ final class WindowsKeyboard {
 	public void destroy() {
 	}
 	
+	boolean isKeyDown(int lwjgl_keycode) {
+		return key_down_buffer[lwjgl_keycode] == 1;
+	}
+
 	public void grab(boolean grab) {
 		if(grab) {
 			if (!grabbed) {

src/java/org/lwjgl/opengl/WindowsKeycodes.java

@@ -534,7 +534,7 @@ final class WindowsKeycodes {
 				return Keyboard.KEY_NUMPADCOMMA;
 			case VK_DIVIDE:
 				return Keyboard.KEY_DIVIDE;
-			case VK_PRINT:
+			case VK_SNAPSHOT:
 				return Keyboard.KEY_SYSRQ;
 			case VK_RMENU:
 				return Keyboard.KEY_RMENU;