[GREENFOOT-542] Pressing right in code completion should close it in some cases
When in code completion in Stride, pressing right arrow will insert the longest common prefix of completions. So if you have written "Und" and the completions are "Underline" and "Understand", you will get "Under". But in some cases there is only one completion available, e.g. "Exce" with completion "Exception". In this case, the code completion should be closed for the user.
- Issue type: Bug
- Priority: Medium
- Fix versions: 3.0.3