Flickering on first zoom out after scene load and after changing a map data layer

[westnordost]

Summary
Zooming in and out usually looks smooth. However, if you modify a map data layer while being zoomed in, the first time you zoom out again will lead to noticeable flickering of the whole map.

The map then flickers the same way it flickers the first time one zooms out after the scene has been loaded, as if the tiles have not been loaded yet. After that, zooming in and out looks smooth again.

Video here: https://www.westnordost.de/misc/tangram-flicker-2131.mp4

Reproduction

• add a map data layer via MapController.addDataLayer
• Zoom in
• Set any geometry on the map data layer or clear it
• Zoom out. Doesn't matter if manually via gesture or with an animation.

Result
The whole map flickers

Expected result
The whole map does not flicker

Environment
Tangram Version 0.11.2
Tested on Android Version 5.1.2
Tested on Sony Xperia Z1 Compact

[westnordost]

The issue is fixed with 0.12.0!

However, there is a regression: #2133