`vips_cache()` + sequential seems to be broken in 8.15 about libvips HOT 2 OPEN

Sorry, I should have updated this issue, I've been looking at it.

The problem is that cache is based on sinkscreen, and that swallows errors (you don't want screen repainting to stop on a dead tile). We should probably deprecate cache, ignoring errors makes it worse than useless for non-interactive work.

I might have found some improvements to tilecache, still poking at it ...

from libvips.

This doesn't seem to be a regression; I can reproduce this with libvips 8.2.x (the minimum libvips requirement of pyvips).

Note that the error in tile-warnings are swallowed by default in pyvips, you can make these appear with:

@@ -3,6 +3,9 @@
 import sys
 import pyvips
 
+import logging
+logging.basicConfig(level=logging.WARNING)
+
 tile_size = 512
 
 for filename in sys.argv[1:]:

from libvips.