Long renames fail

[acenturyandabit]

Steps to reproduce:

1. Create new file a.drawio
2. Create second file b.txt
3. In sidebar, rename file a.drawio to a really long name that takes longer than the file takes to load.drawio

Desired behaviour:

• Can finish rename

Current behaviour:

• When load complete, rename is cancelled

Workaround: Ensure file a.drawio is fully loaded before attempting the rename.