[Unified player settings] Editor becomes unresponsive when Input array value is set to a high number(10000+) under Input settings. The editor should validate the input and reject such very high numbers with an exception.

Steps to reproduce:
1) Create new project
2) Edit > Settings
3) Under Input, set input array value to 10000 or 100000.

Actual result: Observe that the editor becomes unresponsive.
Expected result: The editor validates the input entered in the field and throws an exception for very high numbers.

Reproducible in: 2018.3.0a6 (13fac50c9eea) , 2018.3.0a5, 2018.3.0a4

Note:
Unified player settings are introduced from 2018.3.0a4

Environment:
Windows and Mac