Uses optional legacy method when getting sign lines

src/main/java/net/knarcraft/stargate/portal/PortalSignDrawer.java

@@ -13,7 +13,6 @@ import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.block.Sign;
-import org.bukkit.block.sign.Side;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -184,7 +183,8 @@ public class PortalSignDrawer {
      */
     private void updateSign(@NotNull Sign sign, @NotNull String[] lines) {
         boolean updateNecessary = false;
-        String[] oldLines = sign.getSide(Side.FRONT).getLines();
+
+        String[] oldLines = SignHelper.getLines(sign);
         for (int i = 0; i < 4; i++) {
             if (!oldLines[i].equals(lines[i])) {
                 updateNecessary = true;

src/main/java/net/knarcraft/stargate/portal/property/gate/GateHandler.java

@@ -210,7 +210,7 @@ public class GateHandler {
             Stargate.logSevere(String.format(failString, "Gates must have exactly 2 control points."));
             return false;
         }
-        
+
         if (gate.getLayout().getExit() == null) {
             Stargate.logSevere(String.format(failString, "Gates must have one specified exit point"));
             return false;

src/main/java/net/knarcraft/stargate/utility/SignHelper.java

@@ -17,6 +17,23 @@ public final class SignHelper {
 
     }
 
+    /**
+     * Gets the lines of the given sign
+     *
+     * @param sign <p>The sign to get lines from</p>
+     * @return <p>The lines of the sign</p>
+     */
+    @NotNull
+    public static String[] getLines(@NotNull Sign sign) {
+        if (HAS_SIGN_SIDES) {
+            return sign.getSide(Side.FRONT).getLines();
+        } else {
+            // Note: This is depreciated, but is currently necessary for pre-1.19.4 support
+            //noinspection deprecation
+            return sign.getLines();
+        }
+    }
+
     /**
      * Gets the dye color of the given sign
      *