Index: binaries/data/mods/public/gui/session/input.js
===================================================================
--- binaries/data/mods/public/gui/session/input.js
+++ binaries/data/mods/public/gui/session/input.js
@@ -894,7 +894,7 @@
 			return false;
 
 		case "mousebuttondown":
-			if (ev.button == SDL_BUTTON_LEFT && preSelectedAction != ACTION_NONE)
+			if (ev.button == SDL_BUTTON_RIGHT && preSelectedAction != ACTION_NONE)
 			{
 				var action = determineAction(ev.x, ev.y);
 				if (!action)
@@ -906,7 +906,7 @@
 				}
 				return doAction(action, ev);
 			}
-			else if (ev.button == SDL_BUTTON_RIGHT && preSelectedAction != ACTION_NONE)
+			else if (ev.button == SDL_BUTTON_LEFT && preSelectedAction != ACTION_NONE)
 			{
 				preSelectedAction = ACTION_NONE;
 				inputState = INPUT_NORMAL;