Expose isReplaceable on BlockData (#13180)

Author: rymiel

paper-api/src/main/java/org/bukkit/block/Block.java

@@ -483,9 +483,7 @@ public static int getBlockKeyZ(long packed) {
      */
     boolean isBurnable();
     /**
-     * Check if this block is replaceable
-     * <p>
-     * Determined by Minecraft, representing a block that is not AIR that you can still place a new block at, such as flowers.
+     * Checks if this block can be immediately replaced by another block, such as placing a new block in air or tall grass.
      * @return true if block is replaceable
      */
     boolean isReplaceable();

paper-api/src/main/java/org/bukkit/block/data/BlockData.java

@@ -317,4 +317,10 @@ default float getDestroySpeed(final @NotNull ItemStack itemStack) {
      */
     boolean isRandomlyTicked();
     // Paper end - Tick API
+
+    /**
+     * Checks if this block can be immediately replaced by another block, such as placing a new block in air or tall grass.
+     * @return true if block is replaceable
+     */
+    boolean isReplaceable();
 }

paper-server/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java

@@ -792,4 +792,9 @@ public boolean isRandomlyTicked() {
         return this.state.isRandomlyTicking();
     }
     // Paper end - Block tick API
+
+    @Override
+    public boolean isReplaceable() {
+        return this.state.canBeReplaced();
+    }
 }