put MCEdit before sponge and query by file extension.

Massively reduces loading time a few addon plugins that are literally only trying to get the format of a schematic

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/BuiltInClipboardFormat.java

@@ -86,6 +86,34 @@ public enum BuiltInClipboardFormat implements ClipboardFormat {
 
     },
 
+    /**
+     * The Schematic format used by MCEdit.
+     */
+    MCEDIT_SCHEMATIC("mcedit", "mce", "schematic") {
+
+        @Override
+        public String getPrimaryFileExtension() {
+            return "schematic";
+        }
+
+        @Override
+        public ClipboardReader getReader(InputStream inputStream) throws IOException {
+            NBTInputStream nbtStream = new NBTInputStream(new GZIPInputStream(inputStream));
+            return new MCEditSchematicReader(nbtStream);
+        }
+
+        @Override
+        public ClipboardWriter getWriter(OutputStream outputStream) throws IOException {
+            throw new IOException("This format does not support saving");
+        }
+
+        @Override
+        public boolean isFormat(File file) {
+            String name = file.getName().toLowerCase(Locale.ROOT);
+            return name.endsWith(".schematic") || name.endsWith(".mcedit") || name.endsWith(".mce");
+        }
+    },
+
     SPONGE_SCHEMATIC("sponge", "schem") {
 
         @Override
@@ -126,48 +154,6 @@ public enum BuiltInClipboardFormat implements ClipboardFormat {
         }
     },
 
-    /**
-     * The Schematic format used by MCEdit.
-     */
-    MCEDIT_SCHEMATIC("mcedit", "mce", "schematic") {
-
-        @Override
-        public String getPrimaryFileExtension() {
-            return "schematic";
-        }
-
-        @Override
-        public ClipboardReader getReader(InputStream inputStream) throws IOException {
-            NBTInputStream nbtStream = new NBTInputStream(new GZIPInputStream(inputStream));
-            return new MCEditSchematicReader(nbtStream);
-        }
-
-        @Override
-        public ClipboardWriter getWriter(OutputStream outputStream) throws IOException {
-            throw new IOException("This format does not support saving");
-        }
-
-        @Override
-        public boolean isFormat(File file) {
-            try (NBTInputStream str = new NBTInputStream(new GZIPInputStream(new FileInputStream(file)))) {
-                NamedTag rootTag = str.readNamedTag();
-                if (!rootTag.getName().equals("Schematic")) {
-                    return false;
-                }
-                CompoundTag schematicTag = (CompoundTag) rootTag.getTag();
-
-                // Check
-                Map<String, Tag> schematic = schematicTag.getValue();
-                if (!schematic.containsKey("Materials")) {
-                    return false;
-                }
-            } catch (Exception e) {
-                return false;
-            }
-            return true;
-        }
-    },
-
     BROKENENTITY("brokenentity", "legacyentity", "le", "be", "brokenentities", "legacyentities") {
 
         @Override