GH-2238 fix issues with whitespace/newlines in folder and instance names

api/logic/BaseInstance.cpp

@@ -244,7 +244,7 @@ QString BaseInstance::name() const
 
 QString BaseInstance::windowTitle() const
 {
-    return "MultiMC: " + name();
+    return "MultiMC: " + name().replace(QRegExp("[ \n\r\t]+"), " ");
 }
 
 // FIXME: why is this here? move it to MinecraftInstance!!!