project configuration: improve 'Convert to Repository Library' action

Hide 'Synchronize' actions in 'Library Diff' dialog (it makes no sense because content of a repository library cannot be modified).

java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/LibraryJarsDiffDialog.kt

@@ -48,7 +48,10 @@ class LibraryJarsDiffDialog(libraryFile: VirtualFile,
     setOKButtonText("Replace")
     val request: ContentDiffRequest = DiffRequestFactory.getInstance().createFromFiles(project, libraryFile, downloadedFile)
     panel = DiffManager.getInstance().createRequestPanel(project, disposable, window)
-    panel.putContextHints(DirDiffSettings.KEY, DirDiffSettings().apply { enableChoosers = false })
+    panel.putContextHints(DirDiffSettings.KEY, DirDiffSettings().apply {
+      enableChoosers = false
+      enableOperations = false
+    })
     panel.setRequest(request)
     init()
   }

platform/diff-api/src/com/intellij/ide/diff/DirDiffSettings.java

@@ -42,6 +42,8 @@ public class DirDiffSettings {
   public boolean showNewOnTarget = true;
   public boolean showCompareModes = true;
   public boolean enableChoosers = true;
+  /** If {@code true} it's allowed to synchronize the left and the right parts by copying and deleting files directly in the diff viewer */
+  public boolean enableOperations = true;
   public CompareMode compareMode = CompareMode.CONTENT;
   public double compareTimestampAccuracy = 0;
   public CustomSourceChooser customSourceChooser;

platform/diff-impl/src/com/intellij/openapi/diff/impl/dir/DirDiffTableModel.java

@@ -177,7 +177,7 @@ public class DirDiffTableModel extends AbstractTableModel implements DirDiffMode
   }
 
   public boolean isOperationsEnabled() {
-    return !myDisposed && mySource.isOperationsEnabled() && myTarget.isOperationsEnabled();
+    return !myDisposed && mySettings.enableOperations && mySource.isOperationsEnabled() && myTarget.isOperationsEnabled();
   }
 
   public List<DirDiffElementImpl> getElements() {