Improved power node link preview check

core/src/mindustry/input/DesktopInput.java

@@ -494,7 +494,7 @@ public class DesktopInput extends InputHandler{
             }else if(selected != null){
                 //only begin shooting if there's no cursor event
                 if(!tryTapPlayer(Core.input.mouseWorld().x, Core.input.mouseWorld().y) && !tileTapped(selected.build) && !player.unit().activelyBuilding() && !droppingItem
-                    && !((!settings.getBool("doubletapmine") || selected == prevSelected && Time.timeSinceMillis(selectMillis) < 500) && tryBeginMine(selected)) && !Core.scene.hasKeyboard()){
+                    && !((!settings.getBool("doubletapmine") || (selected == prevSelected && Time.timeSinceMillis(selectMillis) < 500)) && tryBeginMine(selected)) && !Core.scene.hasKeyboard()){
                     player.shooting = shouldShoot;
                 }
             }else if(!Core.scene.hasKeyboard()){ //if it's out of bounds, shooting is just fine

core/src/mindustry/world/Tile.java

@@ -491,6 +491,11 @@ public class Tile implements Position, QuadTreeObject, Displayable{
         return block.solid && block.fillsTile && !block.synthetic() ? data : 0;
     }
 
+    /** @return true if these tiles are right next to eacho ther. */
+    public boolean adjacentTo(Tile tile){
+        return relativeTo(tile) != -1;
+    }
+
     protected void preChanged(){
         if(build != null){
             //only call removed() for the center block - this only gets called once.

core/src/mindustry/world/blocks/power/PowerNode.java

@@ -196,10 +196,23 @@ public class PowerNode extends PowerBlock{
         Boolf<Building> valid = other -> other != null && other.tile() != tile && other.power != null &&
             (other.block.outputsPower || other.block.consumesPower || other.block instanceof PowerNode) &&
             overlaps(tile.x * tilesize + offset, tile.y * tilesize + offset, other.tile(), laserRange * tilesize) && other.team == player.team()
-            && !other.proximity.contains(e -> e.tile == tile) && !graphs.contains(other.power.graph);
+            && !graphs.contains(other.power.graph) &&
+            !Structs.contains(Edges.getEdges(size), p -> { //do not link to adjacent buildings
+                var t = world.tile(tile.x + p.x, tile.y + p.y);
+                return t != null && t.build == other;
+            });
 
         tempTileEnts.clear();
         graphs.clear();
+
+        //add conducting graphs to prevent double link
+        for(var p : Edges.getEdges(size)){
+            Tile other = tile.nearby(p);
+            if(other != null && other.team() == player.team() && other.build != null && other.build.power != null){
+                graphs.add(other.build.power.graph);
+            }
+        }
+
         if(tile.build != null && tile.build.power != null){
             graphs.add(tile.build.power.graph);
         }