Thank you for the plugin work.
Thanks too for the CRC32 change. Running just one file 5 times — the one with 6700 images — and then averaging, ~30% difference. If you wish for more benchmarks, I can try later. Unsure if you consider that difference significant. I also am not sure how I feel about not being able to rename file while keeping date. For the various reasons listed, renaming too I think should keep mod dates if the file is unmodded, e.g. I may merely rename all files to extension .xhtml, or make further renames. Sometimes they may make files change, such as if there links elsewhere, other times not.
For certain publishers, those that separate each chapters xhtml and images into folders, there could be multiple duplicates of some like shared images (e.g. graphical bullets), and in such cases, merging can take a long time, I haven't tested recently on new computer, though before it'd run overnight and not complete. I before have renamed such files outside Sigil. For that and other reasons mentioned, some dialog to perform rename, merge, and perhaps other operations where one can see first toc entry, possible header title, and maybe other metadata could be helpful someday.
I still really really would like any file that is not modified to not have the date changed. Perhaps you disagree, but for me, one might say it is merely the "right" thing to do.
