global tonemap changes according to zoom/visible area
I tried this with two images because i noticed one getting visibly brighter when zooming in 100% and 200%.
I reduced it to the global tonemap module with drago operator
It seems that the images get brighter/darker depending on what is visible in the viewport.
On images where it's not quite as obvious i noticed it with the overexposed indicator on, which then also changes according to what is visible.
It seems to be easily reproducable with pretty much any picture. If it is needed i can attach raw+xmp.
When playing around it seems to be more pronounced the higher the value for the target option is, but i haven't dug deep into this.
reproduced in 1.7.0+963~g30ffbc2 and 1.6.1