Zoom: explosions not drawn properly
In Gtk3 client with zoom x2 enabled, neither unit defeat explosions nor nuke explosions appear.
Bug #683971 notes that even in S2_5, the combat explosion animation basically isn't visible. However, with zoom enabled, when after combat I have scrolled the map view by right-clicking on it I have sometimes seen the explosion sprite momentarily appear at a different location from where the combat took place; plausibly down and to the right. This suggests an additional zoom-related bug. I haven't been able to reproduce the appearance of the explosion sprite.
Most of the time, I don't see any nuke explosion. However, if I explode a nuke in the top left corner of the viewport, I do sometimes see a portion of it. This suggests that the calculation about which bit of the viewport to redraw is wrong in the usual sort of way.
I haven't managed to understand the code well enough to find the bug.
(2.6.0-beta1, Gtk 3.10.8.)