Name clashes should be reported with a message dialog

[phil]

If a file named "foo" exists and you try to create a directory called "foo" Gobby reports a name clash in the status bar. This doesn't look good usability-wise and I think a MessageDialog? should pop up instead so that the user is instantly notified in the common way.

[armin]

I don't like such popup dialogs in general, as they prevent the user from doing whatever she currently does. Note that such a directory creation is an asynchronous operation.

For example, you might create a new directory, but because of network latency the error message about the name clash is shown two seconds later. Within that time, you might already have started to type into an existing document, and be annoyed of being interrupted because of the dialog box.

[armin]

If a node cannot be created the error message in the statusbar now persists, and when you click it there appears a dialog with more detailed error information. Do you think this improves the situation?