Unable to rename tab in unsaved sketch

[per1234]

Using Arduino IDE 1.8.3 Hourly Build 2017/04/26 01:33 with Windows 7 64 bit

• File > New
• Tab menu > New Tab > foo > OK
• Tab menu > Rename > bar > OK - causes error: Failed to rename "foo.ino" to "bar.ino"

The issue occurs with Arduino IDE 1.6.12 and newer. The issue does not occur with Arduino IDE 1.6.11 or older.