Be able to start blink when blurred

**Is your feature request related to a problem? Please describe.**
I have a textarea that is not focused as its in a different pane.
I return `textarea.Blink` in the `Init` fn

When I focus the textarea as i switch the pane, the cursor does not start blinking

**Describe the solution you'd like**
Textarea blurred
Start blink
Textarea does not blink
Focus Textarea
Textarea does blink

**Describe alternatives you've considered**
I could not get it to work otherwise. E.g. calling Blink on update slows the whole program