On #3075 we had the following:

• Test we behave properly when the user changes their [Android] system "Display size" and/or "Font size" settings while the app is already open. See docs of a change in how the system handles this.

(The change was one that took effect when we bumped our targetSdkVersion to 26, from 22.)

Testing now with 25.8.122, on Android on a physical Pixel 2 XL:

• I opened the app, and navigated around.
• Switched to the system settings app, and went to Display > Advanced > Display size, and changed it from "Small" to "Larger".
• Switched back to Zulip.
• Things flickered around for a bit.
• Then we showed the home screen, with unreads...
• and then the unreads and the top icons disappeared, showing only the tabs at bottom and the rest blank.
• Then several seconds later, the unreads and top icons re-appeared.

I repeated the experiment except s/Display size/Font size/, changing it from "Small" to "Largest". Exact same result.

This issue is a low priority, because I believe it's very infrequent for a user to change the display-size or font-size setting. It's important to correctly support the settings having any value; but I expect that users almost always leave the setting at some value that's good for them, and don't keep changing it.