@Ehsan from comment #30 ("I'd be curious to know, FWIW!"):

Turns out that the Thunderbird e-mail front end is one big JS/XUL application:
http://mxr.mozilla.org/comm-central/source/editor/ui/composer/content/editor.js

I haven't looked very much, but I can answer some questions. For example the 
"Bold button" is defined here:
http://mxr.mozilla.org/comm-central/source/editor/ui/composer/content/editorOverlay.xul#1138
There is an observer, so when the bold state changes, it gets noticed and the 
UI is updated.

I will now hunt through this code to see whether I can find the cause of
the lost font.

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

Title:
  composer changes font mid email

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