Recursive "Replace all" in source tab hangs

[beddueimpossibile]

1. Start BlueGriffon v3.1
2. Create a new blank page
3. Write "A" anywhere on the page
4. Switch to source code view
5. Hit Ctrl+R
6. Find "A" and replace with "AA"
7. Click to replace all

The script hangs. After I choose to stop it, I have as many "A" as it could insert until I stopped it. Looks like it is recursive and keeps replacing every occurrence of "A" at every cycle.