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Tile prefetch creates sometimes invalid png files

Description

As mentioned here: https://github.com/MapWindow/MapWinGIS/issues/117

Sometimes 363 bytes PNG-files are saved, which are invalid.
Because they are saved MapWinGIS sees the files and skips getting new ones.

Environment

None

Status

Assignee

Paul Meems

Reporter

Paul Meems

Labels

None

Fix versions

Affects versions

v4.9.6.0

Priority

Medium