Preserve FXML source ranges and extend shared Component projection

designer-standalone/pom.xml

@@ -28,6 +28,14 @@
       <artifactId>junit-jupiter</artifactId>
       <scope>test</scope>
     </dependency>
+    <!-- Keep the main UI before its test-support dependency so its patched Kit class wins. -->
+    <dependency>
+      <groupId>de.neitzel.fxdesigner</groupId>
+      <artifactId>designer-kit-ui</artifactId>
+      <version>${project.version}</version>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
   <build>
     <plugins>

designer-standalone/src/main/java/de/neitzel/fxdesigner/standalone/FileDocuments.java

@@ -64,7 +64,11 @@ public final class FileDocuments implements HostServices.Documents, AutoCloseabl
   }
 
   public CompletionStage<List<DocumentSnapshot>> snapshots() {
-    return submit(() -> documents.values().stream().map(FileDocuments::snapshot).toList());
+    return submit(
+        () -> {
+          for (State s : documents.values()) refresh(s);
+          return documents.values().stream().map(FileDocuments::snapshot).toList();
+        });
   }
 
   public CompletionStage<List<DocumentSnapshot>> unsaved() {
@@ -76,6 +80,18 @@ public final class FileDocuments implements HostServices.Documents, AutoCloseabl
                 .toList());
   }
 
+  private void refresh(State s) throws java.io.IOException {
+    if (!s.text.equals(s.saved)) return; // Dirty draft belongs to the user; save detects conflict.
+    String disk = Files.readString(s.file);
+    if (!disk.equals(s.saved)) {
+      s.text = s.saved = disk;
+      s.undo.clear();
+      s.redo.clear();
+      s.revision++;
+      changes.forEach(listener -> listener.accept(s.file.toUri()));
+    }
+  }
+
   private static DocumentSnapshot snapshot(State s) {
     return new DocumentSnapshot(
         s.file.toUri(), s.revision, s.text, Files.isWritable(s.file), !s.text.equals(s.saved));
@@ -98,12 +114,17 @@ public final class FileDocuments implements HostServices.Documents, AutoCloseabl
     }
 
     public CompletionStage<DocumentSnapshot> snapshot() {
-      return run(() -> FileDocuments.snapshot(s));
+      return run(
+          () -> {
+            refresh(s);
+            return FileDocuments.snapshot(s);
+          });
     }
 
     public CompletionStage<DocumentSnapshot> apply(EditBatch edits) {
       return run(
           () -> {
+            refresh(s);
             String updated = edits.applyTo(FileDocuments.snapshot(s));
             if (!updated.equals(s.text)) {
               s.undo.push(s.text);
@@ -154,6 +175,8 @@ public final class FileDocuments implements HostServices.Documents, AutoCloseabl
                   != null) {
                 Files.setPosixFilePermissions(temp, Files.getPosixFilePermissions(s.file));
               }
+              if (!Files.readString(s.file).equals(s.saved))
+                throw new ConcurrentModificationException("External change; draft retained");
               Files.move(
                   temp,
                   s.file,

designer-standalone/src/test/java/de/neitzel/fxdesigner/standalone/FileDocumentsTest.java

@@ -67,4 +67,32 @@ class FileDocumentsTest {
       assertEquals("draft", d.snapshot().toCompletableFuture().get().text());
     }
   }
+
+  @Test
+  void cleanExternalChangesReloadAndInvalidateOldTransactions() throws Exception {
+    Path file = folder.resolve("External.fxml");
+    Files.writeString(file, "old");
+    try (var docs = new FileDocuments()) {
+      var first = docs.open(file.toUri()).toCompletableFuture().get();
+      var second = docs.open(file.toUri()).toCompletableFuture().get();
+      var initial = first.snapshot().toCompletableFuture().get();
+      Files.writeString(file, "external");
+      var reloaded = second.snapshot().toCompletableFuture().get();
+      assertEquals("external", reloaded.text());
+      assertFalse(reloaded.dirty());
+      assertNotEquals(initial.revision(), reloaded.revision());
+      assertThrows(
+          ExecutionException.class,
+          () ->
+              first
+                  .apply(
+                      new EditBatch(
+                          initial.revision(),
+                          "old edit",
+                          List.of(new EditBatch.Replacement(0, 1, "X"))))
+                  .toCompletableFuture()
+                  .get());
+      assertEquals("external", first.undo().toCompletableFuture().get().text());
+    }
+  }
 }

designer-standalone/src/test/java/de/neitzel/fxdesigner/standalone/KitWorkflowSmoke.java

@@ -127,15 +127,30 @@ public final class KitWorkflowSmoke {
             var field =
                 (TextField)
                     pane.lookupAll(".text-field").stream()
-                        .filter(n -> n instanceof TextField t && t.getText().equals(caption))
+                        .filter(
+                            n ->
+                                n instanceof TextField t
+                                    && t.getText().equals(caption)
+                                    && (t.getId() == null
+                                        || !t.getId().startsWith("component-property-")))
                         .findFirst()
                         .orElseThrow();
             field.setText("alpha bravo charlie");
             pane.applyCss();
             pane.layout();
             var result = new StringBuilder();
-            TextSelectionChecks.run(field, result);
-            System.out.print(result);
+            try {
+              TextSelectionChecks.run(field, result);
+            } finally {
+              System.out.print(result);
+              System.out.println(
+                  "Caption field: "
+                      + field.getId()
+                      + " width="
+                      + field.getWidth()
+                      + " text="
+                      + field.getText());
+            }
             field.setText(caption);
             field.fireEvent(new javafx.event.ActionEvent());
             return null;
@@ -223,6 +238,10 @@ public final class KitWorkflowSmoke {
         if (!Files.readString(Path.of(args[1])).contains("Native canvas edit"))
           throw new AssertionError("Host save missing");
       }
+      try (var document =
+          host.services().documents().open(Path.of(args[1]).toUri()).toCompletableFuture().get()) {
+        ProjectionHostChecks.run(pane, document);
+      }
       fx(
           () -> {
             pane.close();