cwm: fix empty diff preview in remote development

CLM refresh event might come with host ClientId, while preview file
is opened for unattended guest.

GitOrigin-RevId: 0ec0256062fd9eda3f3c2d9db2a06b42e5d08e05

platform/analysis-api/src/com/intellij/openapi/fileEditor/FileEditorManager.java

@@ -93,6 +93,15 @@ public abstract class FileEditorManager {
    */
   public abstract boolean isFileOpen(@NotNull VirtualFile file);
 
+  /**
+   * @return {@code true} if {@code file} is opened, {@code false} otherwise
+   * Unlike {@link #isFileOpen(VirtualFile)} includes files which were opened by all guests during a collaborative development session.
+   */
+  @ApiStatus.Experimental
+  public boolean isFileOpenWithRemotes(@NotNull VirtualFile file) {
+    return isFileOpen(file);
+  }
+
   /**
    * @return all opened files. Order of files in the array corresponds to the order of editor tabs.
    */
@@ -263,5 +272,5 @@ public abstract class FileEditorManager {
    *
    * @param file the file to refresh.
    */
-  public void updateFilePresentation(@NotNull VirtualFile file) {}
+  public void updateFilePresentation(@NotNull VirtualFile file) { }
 }

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/EditorTabPreview.kt

@@ -132,7 +132,7 @@ abstract class EditorTabPreview(protected val diffProcessor: DiffRequestProcesso
     if (isPreviewVisible) openPreview(focus) else closePreview()
   }
 
-  protected fun isPreviewOpen(): Boolean = FileEditorManager.getInstance(project).isFileOpen(previewFile)
+  protected fun isPreviewOpen(): Boolean = FileEditorManager.getInstance(project).isFileOpenWithRemotes(previewFile)
 
   fun closePreview() {
     FileEditorManager.getInstance(project).closeFile(previewFile)