[Bug 1360086] [NEW] Thunderbird 31 regression: changing focus with <TAB> in compose window during address autocompletion

[Brian Norris]

Public bug reported:

There are two similar/related regressions in Thunderbird 31, when typing
address(es) in the 'To' field(s) of the compose window. Both regressions
involve the widget focus behavior when navigating via keyboard after
typing an address that is in your autocompletion address list. In one
case, we see unexpected behavior when pressing <TAB> while
autocompleting an address, and in the second case, we see unexpected
behavior when pressing <SHIFT>+<TAB> in the same scenario.

Comments are borrowed below from the upstream bug reports:

https://bugzilla.mozilla.org/show_bug.cgi?id=1043784
https://bugzilla.mozilla.org/show_bug.cgi?id=1051564

Issue #1:

STR
1 compose new msg
2 in exactly the last empty recipient row (with set recipient type), type a searchword which triggers at least one autocomplete suggestion: e.g. [To: ][searchword >> autocomplete suggestion]
3 press <tab>

Actual Result (TB31)

a) focus moves away from the current recipient row immediately
b) a new empty recipient row is created
c) the just-added recipient row gets focus

Expected Result (as in TB24)

b) don't create a new empty recipient row
c) As a consequence, as there's no other (empty or filled) row widget after the just-filled row widget, move focus to the next widget, which happens to be Subject box.


Issue #2:


STR
1 compose new msg
2 in exactly the last empty recipient row (with set recipient type), type a searchword which triggers at least one autocomplete suggestion: e.g. [To: ][searchword >> autocomplete suggestion]
3 press <shift>+<tab>

Actual Result (TB31)

a) focus moves away from the current recipient row immediately
b) a new empty recipient row is created
c) the just-added recipient row gets focus

Expected Result (as in TB24)

b) no new recipient row is created
c) jump to the 'To:' combo box (i.e., the previous widget, rather than the next widget)

** Affects: thunderbird
     Importance: Unknown
         Status: Unknown

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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Title:
  Thunderbird 31 regression: changing focus with <TAB> in compose window
  during address autocompletion

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