1670132 - No hint for inline image is created for some part of multi-part message in MIME format

Status: RESOLVED WORKSFORME

(Thunderbird :: Message Reader UI, defect)

Description

[Robert Hartmann]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0

Steps to reproduce:

Windows - TB 78.3.2 (32bit)

1. Create a HTML-Message and insert a Screenshot.
2. send that mail (with PGP signing activated) to your self

Actual results:

The message Reader visualized the mail in text from
concrete the part "Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable"
without any hint that there is an inline graphic in html-part

Expected results:

I think there should be a hint, (for text mode only view),
that there is an inline graphic.
Ihink that object
Content-Type: image/png; name="gkbanmbokfnfgaai.png"
Content-Transfer-Encoding: base64
Content-ID: <.....>
Content-Disposition: inline;
filename="gkbanmbokfnfgaai.png"
should be accessible like an attachement, if the message reader is only showing the Content-Type: text/plain part

Comment 1

[Robert Hartmann]

Since there is an simmilar but 11 years old bug - closed about seven years ago,
see bug 547139 ( https://bugzilla.mozilla.org/show_bug.cgi?id=547139 ) ,
I created that new report which only need TB 78.3.2 and where Outlook is not involved.

Maybe the current behavior "not to give a hint that there is an inline graphic"
is a design decision based on some security themes discussed some years ago,
see bug 1367156 comment 17 ( https://bugzilla.mozilla.org/show_bug.cgi?id=1367156#c17 )

or the behavior depends on
bug 671056 ( https://bugzilla.mozilla.org/show_bug.cgi?id=671056 )

Comment 2

[Robert Hartmann]

At the time of writing the description, I thought that the Message Plane had shown the text-only part.
But I was wrong.
If I activate "Ansicht"->"Nachrichteninhalt"->"Reiner Text" (pure text) than the inline *.png graphic is available as attachement to download. Perfect!
But if I activate "Original HTML" or "Vereinfachtes HTML" than the inline png is not shown as attachement nor is shown inline the mail text.

If I had a look to that mail via a webmail interface using Firefox, that the inline graphic is visable to the reader.

Comment 3

[Magnus Melin [:mkmelin]]

(In reply to Robert Hartmann from comment #0)

Actual results:

The message Reader visualized the mail in text from

I assume that is because you have forced you view mode to plain text?
It would not be a reasonable experience to show other parts as attachments for such cases.

Comment 4

[Robert Hartmann]

Attachment: TB_78_3_2_compose_inline_Screenshot.jpg

Comment 5

[Robert Hartmann]

Attachment: TB_78_3_2_view_plaintext_inline_Screenshot_perfect_as_attachement.jpg

Comment 6

[Robert Hartmann]

Attachment: TB_78_3_2_view_html_missing_inline_Screenshot.jpg

Comment 7

[Robert Hartmann]

(In reply to Magnus Melin [:mkmelin] from comment #3)

(In reply to Robert Hartmann from comment #0)

Actual results:

The message Reader visualized the mail in text from

I assume that is because you have forced you view mode to plain text?

Well normaly I realy force TB to show "plain text" only. So I thought it was in plain text mode.
But TB wasn't in "plain text" mode and should show the inline screenshot of the mail.

It would not be a reasonable experience to show other parts as attachments for such cases.

I take three pictures, just to demonstrate, what I want to say:

1. As you can see in comment 4 I create a html mail with an inline screenshot, shown correctly before sending the mail.

2. In comment 5 TB displayed the pure text part and correctly the inline graphic as "attachement".

3. But in comment 6 TB should display the text and the inline graphic because the setting is View "original HTML". But no inline graphic is shown AND no graphic as attachement.

Comment 8

[Magnus Melin [:mkmelin]]

Is it reproducible?

Comment 9

[Robert Hartmann]

(In reply to Magnus Melin [:mkmelin] from comment #8)

Is it reproducible?

I cannot reproduce it anymore with

• release: TB 78.5.1
• beta: TB 84.0b4
• daily: TB 85.0a1 (2020-12-07)

Best regards, Robert

Comment 10

[Wayne Mery (:wsmwk)]

Thanks for the updated info