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core/src/io/anuke/mindustry/input/InputHandler.java

@@ -543,6 +543,7 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
             if(i[0]++ == 0 || i[0] == lineRequests.size){
                 // beginning & end should always be placed
             }else{
+                // check with how many powernodes the *next* tile will overlap
                 int overlaps = 0;
                 for(int j = 0; j < i[0]; j++){
                     if (((PowerNode) req.block).overlaps(lineRequests.get(i[0]).tile(), lineRequests.get(j).tile()) && lineRequests.get(j).block instanceof PowerNode){
@@ -550,6 +551,7 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
                     }
                 }
 
+                // if its more than two it can bridge the gap
                 if(overlaps > 1){
                     req.block = Blocks.air;
                 }