do not catch runtime exception here, it should be caught by
MainView which knows how to handle it
remove author mark up from comments: git blame does it!
remove splash right after main window is visible
another approach to find out when node can be centered
fix NPE
save moved node list for undoing
refactor: extract method for clarity
fix NPE
fix NPE
Use default values if argument is wrong in NumberProperty.setValue(String)
try to fix NPE in quit : consider map in close