Bugzilla

Hi Bob

>if the Message Pane is enabled by pressing F8 the email contents appear on the bottom and the email status goes from Unread to Read which is exactly what is not wanted. That action is the same as opening the email, not previewing the contents.

Yes that is correct. Some people like to scan down the list using eg: arrow keys and do not want to open each one and do not want them marked as read.  But you seem to misunderstand something - whether you realised it or not, in order to see the contents of an email in the 'Message Pane', tab or in a 'Print Preview', that email is opened.
The word 'Preview' in this context - 'Print Preview' does not mean view the contents of something you have not opened as that is not possible  - it is a preview of what is to be printed.

In version 78*
Tested - Message Pane disabled - email new unread - right click select 'Print Preview' - window opens and only shows headers no content is shown as email is not opened.

Tested - Message Pane disabled - email new unread in thread Pane - right click and select 'Mark' > 'As read' 
right click select 'Print Preview' - window opens and now shows contents of the email.
In this case the email was opened in the background to allow contents to be displayed in the Print Preview.

In version 91*:
Tested - Message Pane disabled - email new unread in Thread Pane - right click - 'Print' is disabled so cannot select.

Tested - Message Pane disabled - email new unread in thread Pane - right click and select 'Mark' > 'As read' 
Right click again and the drop down now offers an enabled 'Print' - select Print and Print Preview opens showing an 'about:blank' window.
Note at this point I have not 'opened it' in Message Pane or Tab etc. 
It would seem the 'Print' which opens 'Print Preview' is now enabled if emails is 'Marked as read' BUT no longer automatically opens the email as previous, so cannot display any contents.

If the 'Print' is enabled then it should be able to open the email so  it can display the contents of the email.

But in reality, just open the email and you can then get a 'Print Preview' of email.
Please do not think you were never opening the email because that is not and never was the case. 
If previously you believed you were getting a 'preview' of an unopened email then you were mistaken.

I would say the 'Print Preview' is now more safe because it does not open an email just because it has been marked as read. 

I see the bug as  -  that 'Print' should not be enabled just because of a 'mark as read' - if it cannot open the document then it should not be enabled. Otherwise the user thinks something is wrong.

Hi Bob

>if the Message Pane is enabled by pressing F8 the email contents appear on the bottom and the email status goes from Unread to Read which is exactly what is not wanted. That action is the same as opening the email, not previewing the contents.

Yes that is correct. Some people like to scan down the list using eg: arrow keys and do not want to open each one and do not want them marked as read.  But you seem to misunderstand something - whether you realised it or not, in order to see the contents of an email in the 'Message Pane', tab or in a 'Print Preview', that email is opened.
The word 'Preview' in this context - 'Print Preview' does not mean view the contents of something you have not opened as that is not possible  - it is a preview of what is to be printed.

In version 78*
Tested - Message Pane disabled - email new unread - right click select 'Print Preview' - window opens and only shows headers no content is shown as email is not opened.

Tested - Message Pane disabled - email new unread in thread Pane - right click and select 'Mark' > 'As read' 
right click select 'Print Preview' - window opens and now shows contents of the email.
In this case the email was opened in the background to allow contents to be displayed in the Print Preview.

In version 91*:
Tested - Message Pane disabled - email new unread in Thread Pane - right click - 'Print' is disabled so cannot select.

Tested - Message Pane disabled - email new unread in thread Pane - right click and select 'Mark' > 'As read' 
Right click again and the drop down now offers an enabled 'Print' - select Print and Print Preview opens showing an 'about:blank' window.
Note at this point I have not 'opened it' in Message Pane or Tab etc. 
It would seem the 'Print' which opens 'Print Preview' is now enabled if emails is 'Marked as read' BUT no longer automatically opens the email as previous, so cannot display any contents.

If the 'Print' is enabled then you would expect it to be able to open the email so  it can display the contents of the email.

But in reality, as the code has changed - just open the email and you can then get a 'Print Preview' of email.
Please do not think you were never opening the email because that is not and never was the case. 
If previously you believed you were getting a 'preview' of an unopened email then you were mistaken.

I would say the 'Print Preview' is now more safe because it does not open an email just because it has been marked as read. 

I see the bug as  -  that 'Print' should not be enabled just because of a 'mark as read' - if it cannot open the document then it should not be enabled. Otherwise the user thinks something is wrong.