• KOReader version: nightly git
• Device: android

Issue

This is a blocker for Pull Request #2938.

Can change Android viewport resolution (height & width) with:

local Geom = require("ui/geometry")
local android = require("device/android/device")
(...)
local viewport = Geom:new{x=50, y=100, w=900, h=1600}
android.screen:setViewport(viewport)

but chaning x & y doesn't affect screen/viewport position.

Issue confirmed by @Frenzie (#2938 (comment))

Steps to reproduce

Comparision :
local viewport = Geom:new{x=50, y=100, w=900, h=1600}
below:

with
local viewport = Geom:new{x=0, y=0, w=900, h=1600}
below:

Can anyone help?