Show WhatsApp popup when clicking the message in notification panel

We can enable popup notifications in WhatsApp settings for "Only when screen is on" and "Always show popup".

What I want is, it shouldn't show any popup when message arrives like popups are disabled, but when I click on the message in notification panel, it should show the popup and I can quickly reply.

Similar to what iOS "Quick Reply for WhatsApp" tweak does. Is it possible?

Answer

WhatsApp has implemented this feature on Mar 29, 2016 (v2.12.560). As a fallback for quick reply feature on Android N, WhatsApp added a (kind of) quick reply from notification for all Android version.

When a notification comes, you can expand it (i.e. by sliding down) to show the Reply button. Tapping the Reply button will bring the message as a popup, which you can also reply directly from there.

^{Image courtesy of AndroidPolice}