New subject: [Bug 55100] Final Fantasy XIV: Backspace stops working after backspacing Japanese composition string

June 21, 2023

      https://bugs.winehq.org/show_bug.cgi?id=55100

            Bug ID: 55100
           Summary: Final Fantasy XIV: Backspace stops working after
                    backspacing Japanese composition string
           Product: Wine
           Version: 8.10
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: imm32
          Assignee: wine-bugs(a)winehq.org
          Reporter: achurch+wine(a)achurch.org
      Distribution: ---

Created attachment 74666
  --> https://bugs.winehq.org/attachment.cgi?id=74666
Possible fix

Environment: Linux, LANG=ja_JP.UTF-8, ATOK X3 (XIM)

In Final Fantasy XIV using Japanese input, after backspacing the last character
in a pending composition string (with the fix for bug 55055 in
https://gitlab.winehq.org/wine/wine/-/commit/e5646191723fa4b5e4cb38187e1611a...
applied), the game no longer accepts backspace input in the text field. 
Specifically, given the following sequence:

1) Activate a text input field (such as the screenshot folder path entry field
in Settings -> Other Settings from the title screen).
2) Press backspace in the input field and observe that the last character of
the string is deleted.
3) Activate the IME.
4) Press the "A" key, giving the composition string "あ", which is displayed at
the end of the string.
5) Press backspace, leaving an empty composition string.

Pressing backspace again should delete the character at the end of the string
as in step 2, but instead does nothing.  (Backspace also does not work after
turning on the IME and before any input, as between steps 3 and 4, but does
work correctly immediately after confirming a conversion.)

Sending WM_IME_ENDCOMPOSITION in ImeToAsciiEx() when dwCompStrLen is zero, as
in the attached patch, seems to fix the bug, so FFXIV may be expecting an
explicit ENDCOMPOSITION or similar message to switch from a "waiting for
composition" state to "normal text input".

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[Bug 55100] New: Final Fantasy XIV: Backspace stops working after backspacing Japanese composition string

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