Marcio,
Now here's the thing again. Doing this, it's possible to see the
"search" edit field, as it should be in the first place.
To a sighted user of Firefox, the Search button yields a pop-up that appears identical in those two cases. It has a text box to enter the search target, and two buttons: Search and Cancel. It also has a close (X) in the upper right corner.
I'm astounded that NVDA "sees" them as different.
a very strange edit field which NVDA reports as "MSG".
One possibility occurs to me. When navigating directly an URL ending in /messages page one sees the Messages view of the list. Near the top of that page is a bar that includes a menu for selecting your view, the Hashtags button, the Search button, a button with a funnel icon (expands a date selector), a search box for finding messages by number, the date order control, and the left-right buttons for previous and next page in the message list. NVDA's report of "MSG" makes me think you may have somehow clicked into search by number box (which does hint "Msg #" to the sighted) rather than into the search dialog proper.
By contrast, when one navigates starting at the home page and clicking the Messages button in the left column one may actually be taken to a page whose URL ends in /topics. This is the Topic view of the Messages list, and it lacks the search by message number box.
You may want to report your observations on beta as a suggestion that the NVDA rendering needs investigation and correction. Mark has been very receptive to fixing screen-reader issues.
Shal
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Help:
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/g/GroupManagersForum/wikiEven More Help: Search button at the top of Messages list