Moved getRandomColor method to util/Helpers.cpp (#2974)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/util/Helpers.cpp

@@ -1,5 +1,7 @@
 #include "Helpers.hpp"
 
+#include "providers/twitch/TwitchCommon.hpp"
+
 #include <QLocale>
 #include <QUuid>
 
@@ -47,4 +49,23 @@ QString kFormatNumbers(const int &number)
     return QString("%1K").arg(number / 1000);
 }
 
+QColor getRandomColor(const QString &userId)
+{
+    bool ok = true;
+    int colorSeed = userId.toInt(&ok);
+    if (!ok)
+    {
+        // We were unable to convert the user ID to an integer, this means Twitch started to use non-integer user IDs (or we're on IRC)
+        // Use sum of unicode values of all characters in id / IRC nick
+        colorSeed = 0;
+        for (const auto &c : userId)
+        {
+            colorSeed += c.digitValue();
+        }
+    }
+
+    const auto colorIndex = colorSeed % TWITCH_USERNAME_COLORS.size();
+    return TWITCH_USERNAME_COLORS[colorIndex];
+}
+
 }  // namespace chatterino