fixed not being able to select text backwards

src/messages/Selection.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <tuple>
 #include <utility>
 
 namespace chatterino {
@@ -23,19 +24,13 @@ struct SelectionItem {
 
     bool operator<(const SelectionItem &b) const
     {
-        if (this->messageIndex < b.messageIndex) {
-            return true;
-        }
-        if (this->messageIndex == b.messageIndex &&
-            this->charIndex < b.charIndex) {
-            return true;
-        }
-        return false;
+        return std::tie(this->messageIndex, this->charIndex) <
+               std::tie(b.messageIndex, b.charIndex);
     }
 
     bool operator>(const SelectionItem &b) const
     {
-        return this->operator!=(b) && b.operator<(*this);
+        return b.operator<(*this);
     }
 
     bool operator==(const SelectionItem &b) const