The Proton Email people did testing to reproduce this issue and provided feedback resolving this issue. For bug 1895549 I was told to put my mail processing rule in two steps with the first step copying to the destination folder and the second step marking read in the source folder. If both are done in the same step the email is marked read before being copied regardless of the order given in the step and email shows read in the destination folder, too. Unfortunately, using two steps prevents Thunderbird from processing the rule if the message has been opened elsewhere on a different platform, before being pulled and processed in Thunderbird. Putting the copy plus mark read back into the same step, to try and resolve this issue, of not processing email if already opened, is something I never would have thought of doing. Probably bug 1902930 (this one) should remain a bug and bug 1895549 not worried about at this time.
Bug 1902930 Comment 1 Edit History
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The Proton Email people did testing to reproduce this issue and provided feedback resolving this issue. For bug 1895549 I was told to put my mail processing rule in two steps with the first step copying to the destination folder and the second step marking read in the source folder. If both are done in the same step the email is marked read before being copied regardless of the order given in the step and email shows read in the destination folder, too. Unfortunately, using two steps prevents Thunderbird from processing the rule if the message has been opened elsewhere on a different platform, before being pulled and processed in Thunderbird. Putting the copy plus mark read back into the same step, to try and resolve this issue, of not processing email if already opened, is something I never would have thought of doing. I made one rule with one step and bug 1902930 (this one) went away. I also backup up my Thunderbird folders, did some test emails, and restored. Thunderbird pulled and processed all the emails a second time, which is good. Probably bug 1902930 (this one) should remain a bug and bug 1895549 not worried about at this time.
The Proton Email people did testing to reproduce this issue and provided feedback resolving this issue. For bug 1895549 I was told to put my mail processing rule in two steps with the first step copying to the destination folder and the second step marking read in the source folder. If both are done in the same step the email is marked read before being copied regardless of the order given in the step and email shows read in the destination folder, too. Unfortunately, using two steps prevents Thunderbird from processing the rule if the message has been opened elsewhere on a different platform, before being pulled and processed in Thunderbird. Putting the copy plus mark read back into the same step, to try and resolve this issue, of not processing email if already opened, is something I never would have thought of doing. I made one rule with one step and bug 1902930 (this one) went away. I also backed up my Thunderbird folders, did some test emails, and restored. Thunderbird pulled and processed all the emails a second time, which is good. Probably bug 1902930 (this one) should remain a bug and bug 1895549 not worried about at this time.