topcat: fix TAP load window to stay open by default

All table load dialogues by default are disposed when a table is loaded,
but you can change this behaviour with the "Stay Open" option.
For TAP it's usually pretty annoying for it to keep closing, so set
it pinned open by default.  Maybe I should do this for some other
load dialogues too?

topcat/src/docs/sun253.xml

@@ -20306,6 +20306,9 @@ introduced since the last version:
         MultiCone button in the main Control Window toolbar.
         MultiCone is now for most purposes deprecated.</li>
     <li>Fixed bug reversing cube and sphere navigation help buttons.</li>
+    <li>Fixed TAP load dialogue so that by default it stays open after a
+        table is loaded (the <label>Stay Open</label> option is set true
+        by default).</li>
     </ul>
     </p></dd>
 

topcat/src/main/uk/ac/starlink/topcat/TableLoadDialogWindow.java

@@ -46,6 +46,7 @@ public TableLoadDialogWindow( Component parent, TableLoadDialog tld,
             new ToggleButtonModel( "Stay Open", ResourceIcon.KEEP_OPEN,
                                    "Keep window open even after " +
                                    "successful load" );
+        stayOpenModel_.setSelected( isPinnedDflt( tld ) );
         getToolBar().add( stayOpenModel_.createToolbarButton() );
         getToolBar().addSeparator();
         JMenu windowMenu = getWindowMenu();
@@ -127,4 +128,17 @@ public void endSequence( boolean cancelled ) {
         /* Perform asynchronous table loading. */
         controlWin.runLoading( loader, loadClient, tld_.getIcon() );
     }
+
+    /**
+     * Determines whether the window associated with a given load dialogue
+     * should be pinned open by default.
+     *
+     * @param  tld  load dialogue
+     * @return   if false, window will disappear when a load is complete;
+     *           if true, it will stay posted
+     */
+    private static boolean isPinnedDflt( TableLoadDialog tld ) {
+        String cname = tld.getClass().getName();
+        return cname.endsWith( "TapTableLoadDialog" );
+    }
 }