Fix some horrendous code where methods supposed to return a boolean only ever return true (#1718)

worldedit-core/src/main/java/com/fastasyncworldedit/core/wrappers/LocationMaskedPlayerWrapper.java

@@ -70,57 +70,57 @@ public class LocationMaskedPlayerWrapper extends AsyncPlayer {
 
     @Override
     public boolean ascendLevel() {
-        if (allowTeleport) {
+        if (allowTeleport && super.ascendLevel()) {
-            super.ascendLevel();
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public boolean descendLevel() {
-        if (allowTeleport) {
+        if (allowTeleport && super.descendLevel()) {
-            super.descendLevel();
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public boolean ascendToCeiling(int clearance) {
-        if (allowTeleport) {
+        if (allowTeleport && super.ascendToCeiling(clearance)) {
-            super.ascendToCeiling(clearance);
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public boolean ascendToCeiling(int clearance, boolean alwaysGlass) {
-        if (allowTeleport) {
+        if (allowTeleport && super.ascendToCeiling(clearance, alwaysGlass)) {
-            super.ascendToCeiling(clearance, alwaysGlass);
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public boolean ascendUpwards(int distance) {
-        if (allowTeleport) {
+        if (allowTeleport && super.ascendUpwards(distance)) {
-            super.ascendUpwards(distance);
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public boolean ascendUpwards(int distance, boolean alwaysGlass) {
-        if (allowTeleport) {
+        if (allowTeleport && super.ascendUpwards(distance, alwaysGlass)) {
-            super.ascendUpwards(distance, alwaysGlass);
             update();
-        }
             return true;
         }
+        return false;
+    }
 
     @Override
     public void floatAt(int x, int y, int z, boolean alwaysGlass) {

worldedit-core/src/main/java/com/sk89q/worldedit/command/NavigationCommands.java

@@ -29,13 +29,11 @@ import com.sk89q.worldedit.command.util.Logging;
 import com.sk89q.worldedit.entity.Player;
 import com.sk89q.worldedit.util.Location;
 import com.sk89q.worldedit.util.formatting.text.TextComponent;
-import com.sk89q.worldedit.world.World;
 import org.enginehub.piston.annotation.Command;
 import org.enginehub.piston.annotation.CommandContainer;
 import org.enginehub.piston.annotation.param.Arg;
 import org.enginehub.piston.annotation.param.Switch;
 
-import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.sk89q.worldedit.command.util.Logging.LogMode.POSITION;
 
@@ -79,8 +77,6 @@ public class NavigationCommands {
             @Arg(desc = "# of levels to ascend", def = "1")
                     int levels
     ) throws WorldEditException {
-        World world = player.getWorld();
-        checkArgument(levels >= 1 && levels <= (world.getMaxY() - world.getMinY()), "1 <= levels <= world height");
         int ascentLevels = 0;
         while (player.ascendLevel()) {
             ++ascentLevels;
@@ -106,8 +102,6 @@ public class NavigationCommands {
             @Arg(desc = "# of levels to descend", def = "1")
                     int levels
     ) throws WorldEditException {
-        World world = player.getWorld();
-        checkArgument(levels >= 1 && levels <= (world.getMaxY() - world.getMinY()), "1 <= levels <= world height");
         int descentLevels = 0;
         while (player.descendLevel()) {
             ++descentLevels;