No obvious visual indication that Diffing is done.
Running Meld (v3.20.2) on Ubuntu (20.04.2) VM.
Had a home LAN device FS mounted to my Ubuntu VM via
Diffed a local HDD dir with a dir on said net-mounted partition.
Due to this, the diff was taking exceptionally long (> ~7m).
After selecting the two dirs to diff, it shows the first-level dirs as though it's done diffing, even though it's not necessarily done.
So I blindly thought that, "Oh, great, I can propagate diffs now" because there was NO obvious indications that the diff was NOT complete.
I blindly trusted Meld, and wasted ~5hrs because I was fooled into thinking my two dirs had no diffs, when in reality they DID have diffs but I didn't get to see them because it was taking exceptionally long. Bad customer experience.