[Github-comments] [geany/geany] segfault calling sci_get_length when dragging a file onto Geany when no other documents are open (Issue #2998)

[xiota]

I'm getting a segfault when calling `sci_get_length(editor->sci)` in a function responding to an `editor-notify` signal.  This occurs only when dropping files into Geany when no documents are open (the only document is "untitled").  This problem does not occur when:

* Double clicking a file in the file manager
* Dragging a file when other documents are open
* Draggin a file after modifying the untitled document

Checking that `editor`, `editor->document`, and `editor->sci` are not `NULL` does not prevent the segfault.

```C
bool NewPluginClass::editor_notify(GObject *object, GeanyEditor *editor, SCNotification *nt, NewPluginClass *self) {
  if (!self->enable || !DOC_VALID(editor->document) || !editor->document->changed) {
    return false;
  }

  if (editor && editor->sci && sci_get_length(editor->sci) == 0) {
    // testing
  }

  return false;
}
```

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