"Truncated by diffoscope" message part of diff

currently comparing files from issue: #109

such as: https://salsa.debian.org/reproducible-builds/diffoscope/uploads/6c10e84e6b1d75b6744e2f5d95a8adbd/Hamagen-1.3.8-index.android.bundle

https://salsa.debian.org/reproducible-builds/diffoscope/uploads/ad87503eac2eabd7cf53f5fbf4a94bef/Hamagen-1.3.8-qa-main.jsbundle

will result in message "​truncated by diffoscope len: [number] SHA: [sha-string]" this message is part of the diff (it will have background-color, as it's part of the diff but it's not) see here the line before 32:

fix:

• put some indication of the error in the diff-itself which will not be part of diff, such as new line (without line-counter, before line 32 in above example) with "warning/error icon" instead with the text message: "​truncated by diffoscope len: [number] SHA: [sha-string]"