IDocument: Rename defaultPath and suggestedFileName

To fallbackSaveAsPath and fallbackSaveAsFileName. That makes it clearer
what they are for, and that they actually belong to each other.

Change-Id: Ie5b83b9db77d39a7fe9e979cc8f22b7f5b9101a3
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/coreplugin/dialogs/saveitemsdialog.cpp

@@ -67,7 +67,7 @@ SaveItemsDialog::SaveItemsDialog(QWidget *parent,
         QString directory;
         QString fileName = document->filePath().toString();
         if (fileName.isEmpty()) {
-            visibleName = document->suggestedFileName();
+            visibleName = document->fallbackSaveAsFileName();
         } else {
             QFileInfo info = QFileInfo(fileName);
             directory = info.absolutePath();