CHE-4998: Update modification stamp on open and on update document.

Signed-off-by: Aleksandr Andriienko <oandriie@redhat.com>

Author: AndrienkoAleksandr

ide/che-core-ide-api/src/main/java/org/eclipse/che/ide/api/resources/ModificationTracker.java

@@ -30,4 +30,12 @@ public interface ModificationTracker {
      * @return modification tracker value
      */
     String getModificationStamp();
+
+    /**
+     * Update modification tracker value by content. Modification tracker is a value is changed by any modification of the content
+     * of the file.
+     *
+     * @param content actual file content
+     */
+    void updateModificationStamp(String content);
 }

ide/che-core-ide-app/src/main/java/org/eclipse/che/ide/resources/impl/FileImpl.java

@@ -110,7 +110,7 @@ public String getNameWithoutExtension() {
     /** {@inheritDoc} */
     @Override
     public Promise<Void> updateContent(String content) {
-        setModificationStamp(TextUtils.md5(content));
+        updateModificationStamp(content);
 
         return resourceManager.write(this, content);
     }
@@ -140,4 +140,9 @@ public void setModificationStamp(String modificationStamp) {
     public String getModificationStamp() {
         return modificationStamp;
     }
+
+    @Override
+    public void updateModificationStamp(String content) {
+        this.modificationStamp = TextUtils.md5(content);
+    }
 }

ide/che-core-orion-editor/src/main/java/org/eclipse/che/ide/editor/orion/client/OrionDocument.java

@@ -12,6 +12,8 @@
 
 import com.google.web.bindery.event.shared.HandlerRegistration;
 
+import org.eclipse.che.ide.api.resources.File;
+import org.eclipse.che.ide.api.resources.VirtualFile;
 import org.eclipse.che.ide.editor.orion.client.jso.ModelChangedEventOverlay;
 import org.eclipse.che.ide.editor.orion.client.jso.OrionEditorOverlay;
 import org.eclipse.che.ide.editor.orion.client.jso.OrionPixelPositionOverlay;
@@ -197,6 +199,7 @@ public int pixelToOffset(PixelCoordinates coordinates) {
 
     public void replace(int offset, int length, String text) {
         this.editorOverlay.getModel().setText(text, offset, offset + length);
+        updateModificationTimeStamp();
     }
 
     @Override
@@ -205,6 +208,14 @@ public void replace(int startLine, int startChar, int endLine, int endChar, Stri
         int lineStart = model.getLineStart(startLine);
         int lineEnd = model.getLineStart(endLine);
         editorOverlay.setText(text, lineStart + startChar, lineEnd + endChar);
+        updateModificationTimeStamp();
+    }
+
+    private void updateModificationTimeStamp() {
+        VirtualFile file = this.getFile();
+        if (file  instanceof File) {
+            ((File)file).updateModificationStamp(editorOverlay.getText());
+        }
     }
 
     public int getContentsCharCount() {

ide/che-core-orion-editor/src/main/java/org/eclipse/che/ide/editor/orion/client/OrionEditorPresenter.java

@@ -1014,7 +1014,13 @@ public void initialized(EditorWidget widget) {
             editorView.setEditorWidget(editorWidget);
 
             document = editorWidget.getDocument();
-            document.setFile(input.getFile());
+            final VirtualFile file = input.getFile();
+            document.setFile(file);
+
+            if (file instanceof File) {
+                ((File)file).updateModificationStamp(content);
+            }
+
             cursorModel = new OrionCursorModel(document);
 
             editorWidget.setTabSize(configuration.getTabWidth());
@@ -1031,7 +1037,7 @@ public void initialized(EditorWidget widget) {
             if (delayedFocus) {
                 editorWidget.refresh();
                 editorWidget.setFocus();
-                setSelection(new Selection<>(input.getFile()));
+                setSelection(new Selection<>(file));
                 delayedFocus = false;
             }
 

wsagent/che-core-api-project/src/main/java/org/eclipse/che/api/vfs/impl/file/event/detectors/EditorFileTracker.java

@@ -202,6 +202,7 @@ private Consumer<String> getDeleteConsumer(String endpointId, String path) {
             @Override
             public void run() {
                 if (!Files.exists(FileWatcherUtils.toNormalPath(root.toPath(), it))) {
+                    hashRegistry.remove(path + endpointId);
                     FileStateUpdateDto params = newDto(FileStateUpdateDto.class).withPath(path).withType(DELETED);
                     transmitter.newRequest()
                                .endpointId(endpointId)