fixed PY-14322 IPython Notebook: do not move focis out of the cell on ESC in the completion popup
do not rely on getStubBuilder() to return new stub builder
Extract CardLayoutPanel from ConfigurableEditor
@NotNull
UINotifyConnector memory leak fixed
fixed PY-14310 IPython Notebook: active cell green selection is not updated on selecting code inside the cell
fixed NPE on creating new Ipython notebook
Merge remote-tracking branch 'origin/master'