Compare last modified time in ms.

Fixes #574

Signed-off-by: azerr <[email protected]>

org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/model/FilesChangedTracker.java

@@ -34,34 +34,39 @@ public class FilesChangedTracker {
 	private static class FileChangedTracker {
 
 		private final Path file;
-		private FileTime lastModified;
+		private Long lastModified;
 
 		public FileChangedTracker(Path file) {
 			this.file = file;
 			if (Files.exists(file)) {
 				try {
-					lastModified = Files.getLastModifiedTime(file);
+					lastModified = Files.getLastModifiedTime(file).toMillis();
 				} catch (IOException e) {
 					LOGGER.log(Level.SEVERE, "Get last modified time failed", e);
 				}
 			}
 		}
 
 		public boolean isDirty() {
+			Long old = lastModified;
+			long currentLastModified = 0;
 			try {
 				if (!Files.exists(file)) {
 					// This case occurs when user delete the XML Schema / DTD file
+					System.err.println("FILE [" + file.toString() + "] IS DELETED!!!");
 					return true;
 				}
-				FileTime currentLastMofied = Files.getLastModifiedTime(file);
-				if (!currentLastMofied.equals(lastModified)) {
-					lastModified = currentLastMofied;
+				currentLastModified = Files.getLastModifiedTime(file).toMillis();
+				if (lastModified == null || lastModified != currentLastModified) {
+					lastModified = currentLastModified;
+					System.err.println("IS DIRTY! [" + file.toString() + "] lastModified=" + old + ", currentLastModified=" + currentLastModified);
 					return true;
 				}
 			} catch (IOException e) {
 				LOGGER.log(Level.SEVERE, "Get last modified time failed", e);
 				return true;
 			}
+			System.err.println("NO DIRTY! [" + file.toString() + "] lastModified=" + old + ", currentLastModified=" + currentLastModified);
 			return false;
 		}