ENH allow to specify tab insertion mode - default split-right

Author: COLLONVAL Frederic

sidecar/sidecar.py

@@ -23,4 +23,4 @@ class Sidecar(Output):
     _view_module = Unicode(module_name).tag(sync=True)
     _view_module_version = Unicode(EXTENSION_SPEC_VERSION).tag(sync=True)
     title = Unicode('Sidecar').tag(sync=True)
-    anchor = CaselessStrEnum(['main', 'right'], default_value='main', allow_none=False).tag(sync=True)
+    anchor = CaselessStrEnum(['split-right', 'split-left', 'split-top', 'split-bottom', 'tab-before', 'tab-after', 'right'], default_value='split-right', allow_none=False).tag(sync=True)

src/plugin.ts

@@ -77,8 +77,7 @@ function activateWidgetExtension(app: JupyterLab, registry: IJupyterWidgetRegist
             //   app.shell.add(w, 'left');
             //   app.shell.expandLeft();
             } else {
-              app.shell.addToMainArea(w);
-              w.activate()
+              app.shell.addToMainArea(w, {mode: anchor});
             }
           }
         }

src/widget.ts

@@ -24,7 +24,7 @@ class SidecarModel extends OutputModel {
       _view_module: SidecarModel.view_module,
       _view_module_version: SidecarModel.view_module_version,
       title: 'Sidecar',
-      anchor: 'main'
+      anchor: 'split-right'
     };
   }