[vcs-log] if a model with zero rows is set (eg after initializing new repo without any commits) wait until some commits appear and init column sizes only then IDEA-135308

platform/vcs-log/impl/src/com/intellij/vcs/log/ui/frame/VcsLogGraphTable.java

@@ -57,10 +57,7 @@ import org.jetbrains.annotations.Nullable;
 import sun.swing.table.DefaultTableCellHeaderRenderer;
 
 import javax.swing.*;
-import javax.swing.event.CellEditorListener;
-import javax.swing.event.ChangeEvent;
-import javax.swing.event.ChangeListener;
-import javax.swing.event.TableModelEvent;
+import javax.swing.event.*;
 import javax.swing.table.*;
 import java.awt.*;
 import java.awt.datatransfer.StringSelection;
@@ -86,6 +83,14 @@ public class VcsLogGraphTable extends JBTable implements TypeSafeDataProvider, C
   private final GraphCommitCellRender myGraphCommitCellRender;
   private final MyDummyTableCellEditor myDummyEditor = new MyDummyTableCellEditor();
   @NotNull private final TableCellRenderer myDummyRenderer = new DefaultTableCellRenderer();
+  private final TableModelListener myColumnSizeInitializer = new TableModelListener() {
+    @Override
+    public void tableChanged(TableModelEvent e) {
+      if (initColumnSize()) {
+        getModel().removeTableModelListener(this);
+      }
+    }
+  };
 
   private boolean myColumnsSizeInitialized = false;
 
@@ -132,14 +137,24 @@ public class VcsLogGraphTable extends JBTable implements TypeSafeDataProvider, C
   @Override
   public void setModel(@NotNull TableModel model) {
     super.setModel(model);
-    // initialize sizes once, when the real non-empty model is set
-    if (!myColumnsSizeInitialized && model.getRowCount() > 0) {
+    if (getModel().getRowCount() > 0) {
+      initColumnSize();
+    }
+    else {
+      model.addTableModelListener(myColumnSizeInitializer);
+    }
+  }
+
+  private boolean initColumnSize() {
+    if (!myColumnsSizeInitialized && getModel().getRowCount() > 0) {
       myColumnsSizeInitialized = true;
       setColumnPreferredSize();
       setAutoCreateColumnsFromModel(false); // otherwise sizes are recalculated after each TableColumn re-initialization
 
       getColumnModel().getColumn(GraphTableModel.ROOT_COLUMN).setHeaderRenderer(new RootHeaderRenderer());
+      return true;
     }
+    return false;
   }
 
   private void setColumnPreferredSize() {