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[Ehsan-mozilla <584632@xxxxxxxxxxxxxxxxxx>]

(In reply to Jorg K from comment #26)
> Re. your last comment:
> > I _think_ to fix that part you need to get Thunderbird tell Gecko about how
> > to format the new paragraph. 
> 
> I tried with a <div contenteditable> in Firefox. The editor handles
> insertion of images by itself. So the question is: How could Thunderbird,
> the invoker of the editor, be notified, so it could in turn do whatever it
> does normally (I need to investigate what that is exactly) to communicate
> that the format required after the insertion?

If it works with a simple contenteditable element in Firefox, then
Thunderbird is doing something that it should not be doing.  I have no
idea what that might be though.  But at any rate, that is off topic for
this bug.

> Can an callback be installed
> that the editor calls when new nodes are created in the DOM tree?

You can use a mutation observer to be notified when new nodes are
injected into the tree, but like I said, that doesn't help if
Thunderbird is doing something that it should not be doing.

> So far I get the following picture of the interaction between Thunderbird
> and the editor:
> 1) Thunderbird invokes the editor and communicates the initial conditions,
> font, size, etc.
> 2) The editor does all the editing. When new nodes are created in the DOM,
> no "special" style element is used, so to the Thunderbird user it looks like
> the style gets lost.
> 3) No callback to Thunderbird takes place while the editor is running.
> 4) Thunderbird may send "commands" to the editor, to change the font, bold,
> etc.
> 5) When the editing is done, Thunderbird receives a copy of the DOM (or the
> plain text or HTML) and stores it or sends it.

I'm not familiar enough with the Thunderbird side of things to be able
to tell how it interacts with Gecko.  And I don't know anyone who does.
Your best bet may be reading the code.

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https://bugs.launchpad.net/bugs/584632

Title:
  composer changes font mid email

Status in Mozilla Thunderbird Mail and News:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: thunderbird

  As I'm typing my emails in Thunderbird, I can see what appears to be a
  font size change on screen, normally in the second line of text. The
  second line appear smaller than the first. It's barely perceptible, so
  half them time I think I am imagining it.

  Well, I've started Bccing to myself to check, and the emails I am
  receiving from myself are not only a different size, they're also a
  different font. Composer starts in some default serif, and by the
  second line is sans. I'd bee glad to email someone viz thunderbird,
  and also send along a screenshot of how it looks while I am typing.

  Thanks.

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