Start in thumbnail view
Drag and drop file to program for modify (Corel Photo-Paint)
Modify file, save and close file
Return to Thumbnail view
Thumbnail is not instantly updated
Switch to full screen: file is again unmodified
View some files forward and return to modified file
Thumbnail is finally updated
Tested with TIFF 1, 8, 24 BPP, LZW and uncompressed.
Thumbnail refresh
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