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Latest build now delete the render data when hitting escape when rendering, instead of keeping the rendered tiles
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.71

Blender Version
Broken: version: 2.80 (sub 55), branch: blender2.7, commit date: 2019-04-08 21:54, hash: rB2a79e3463130
Worked: (optional)

Short description of error

Hello

in this week 2.8 builds (windows? maybe more?) erase the rendering data when escaping in the middle of a render.

before this week, hitting escape during the render would keep the rendered tiles in memory, now hitting escape erase everything.

is this a new design decision ? or its an unwanted bug ?
i’ll report it if its not wanted

Exact steps for others to reproduce the error
press F12 in cycles
press ESC while the render is not finished
render is deleted

Event Timeline

i couldn't reproduce the bug on a clean new portable build, weird
i cannot see the X symbol near the rneder bar statut

in my current build 2019-04-08, "save buffer" make the bug, if i uncheck save buffer, it work like normal
so i tried to reproduce the settings in the last build from 2019-04-15, checked "save buffer"
the render still act weirdly ! now its another problem; we dont see the rendered tile when they are rendering, we only see them when the render is finished !
there's clearly a problem with the save buffer option