Add OnFocusLost event for input and text controls

[Christoph]

Hey

Please add an additional OnFocusLost event for the input and text controls to able to execute some logic when the focus is not longer on a control. e.g. in our case we want to hide a text input control and show a lable control as a placeholder when the text is empty, but this not possible because we are not able to check for content and hide the textbox when the user is deselecting the text input control.

Thanks Christoph

[MR_Malakooti]

Since I am using a timer control to rectify this problem, it will be useful to trigger stopping the timer control to increase the performance of the app and reducing the timer controls. 

Also please have a look at this idea:

https://powerusers.microsoft.com/t5/Power-Apps-Ideas/Jump-to-the-next-Item-when-Text-input-meets-the...

Thank you