Steps to reproduce:
1) Create a new project
2) Change platform to Android
3) Player Settings >> Other Settings >> Identification
4) In Package Name, change 'com.Company.ProductName' to 'com.Company.something'
5) Click mouse button on a Scene view or any other window(Except PlayerSettings window)
6) You should see 'com.Company.something' changed back to 'com.Company.ProductName'

Workaround: Press Enter before focusing on other window

Expected result: Edit should be saved after focusing on other window
Actual result: Edit is not saved

Regression from : 5.6.0b6

Reproduced with:
5.6.0b6, 5.6.0b7

Not reproduced with:
5.4.4p3, 5.5.1p3, 5.6.0b3, 5.6.0b5