Clarify the purpose of removedOffset

src/main/scala/ocelot/desktop/ui/widget/LogWidget.scala

@@ -39,10 +39,18 @@ abstract class LogWidget extends Widget {
         }
     }
 
+    // when entries are removed from the head, all consecutive entries need to be shifted up.
+    // doing that for every single removal is **very** inefficient.
+    // instead, we keep the widgets where they are without shifting, having the offset accumulate, and update their
+    // positions only once per frame (in `draw`).
     private def removedOffset: Float = entries.headOption.map(_.y - EntryMargin).getOrElse(0)
 
     private def applyRemovedOffset(): Unit = {
       val offset = removedOffset
+      
+      if (offset == 0) {
+        return
+      }
 
       for (entry <- entries) {
         entry.y -= offset