Preserve FXML source ranges and extend shared Component projection

designer-intellij/src/main/java/de/neitzel/fxdesigner/intellij/IntellijDocuments.java

@@ -149,6 +149,21 @@ public final class IntellijDocuments implements HostServices.Documents, AutoClos
     }
   }
 
+  private void refreshClean(State s) throws java.io.IOException {
+    var manager = FileDocumentManager.getInstance();
+    if (manager.isDocumentUnsaved(s.document)) return;
+    String disk = Files.readString(Path.of(s.file.getPath()));
+    if (disk.equals(s.document.getText())) {
+      s.disk = disk; // Native autosave already persisted this revision; do not reload it.
+      return;
+    }
+    if (!disk.equals(s.disk)) {
+      s.file.refresh(false, false);
+      manager.reloadFromDisk(s.document);
+      s.disk = disk;
+    }
+  }
+
   private DocumentSnapshot snapshot(State s) {
     return new DocumentSnapshot(
         canonicalUri(s.file),
@@ -176,12 +191,17 @@ public final class IntellijDocuments implements HostServices.Documents, AutoClos
     }
 
     public CompletionStage<DocumentSnapshot> snapshot() {
-      return run(() -> IntellijDocuments.this.snapshot(s));
+      return run(
+          () -> {
+            refreshClean(s);
+            return IntellijDocuments.this.snapshot(s);
+          });
     }
 
     public CompletionStage<DocumentSnapshot> apply(EditBatch edits) {
       return run(
           () -> {
+            refreshClean(s);
             edits.applyTo(IntellijDocuments.this.snapshot(s));
             var ranges = new ArrayList<>(edits.replacements());
             ranges.sort(Comparator.comparingInt(EditBatch.Replacement::start));