Fix multiple cursors crashes by sorting cursors by min range

src/basic/basic.h

@@ -95,6 +95,13 @@ T Clamp(T value, T min, T max) {
     return value;
 }
 
+template <class T>
+void Swap(T *a, T *b) {
+    T temp = *a;
+    *a     = *b;
+    *b     = temp;
+}
+
 inline bool IsPowerOf2(size_t x) {
     size_t result = (((x) & ((x)-1)) == 0);
     return result;