User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Steps to reproduce: I use Thunderbird Versin 52.1.1 in Japanese. Send the approval request mail of the PDF file using Adobe Acrobat pro 10.1.14. Actual results: The text does not line break at the approval request mail of the PDF file. Expected results: The text is line broken. When it was 52.1.0 it was actually broken.
Sadly I don't understand the report. Can you please attach a screen shot. "Approval request mail"? Are you saying that some panel is to small?
The attached PDF shows a screen shot of two messages. The left one "no good" seems unformatted, the right one, "good", formatted. I think I understand now what's going on. You're using some third party software (Adobe Acrobat pro 10.1.14) to create an e-mail message via MAPI. The formatting in such messages is currently missing proper formatting, that's a known bug and will be fixed in TB 52.2. Sorry about the inconvenience. See bug 1366196.