Merge pull request #1540 from player-03/linux_clipboard

Work around unreliable clipboard on Linux.

src/lime/system/Clipboard.hx

@@ -52,10 +52,22 @@ class Clipboard
 	// Get & Set Methods
 	private static function get_text():String
 	{
-		// Native clipboard calls __update when clipboard changes
+		// Native clipboard (except Xorg) calls __update when clipboard changes.
 
 		#if (flash || js || html5)
 		__update();
+		#elseif linux
+		// Xorg won't call __update until we call set_text at least once.
+		// Details: SDL_x11clipboard.c calls X11_XSetSelectionOwner,
+		// registering this app to receive clipboard events.
+		if (_text == null)
+		{
+			__update();
+
+			// Call set_text while changing as little as possible. (Rich text
+			// formatting will unavoidably be lost.)
+			set_text(_text);
+		}
 		#end
 
 		return _text;