[Bug 54318] New: Rich Edit inserts newly composed text at wrong position when system IME composition ends while a selection is active

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54318

Bug ID: 54318
           Summary: Rich Edit inserts newly composed text at wrong
                    position when system IME composition ends while a
                    selection is active
           Product: Wine
           Version: 8.0-rc4
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: richedit
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
      Distribution: ---

When the user attempts to perform select-and-replace with newly composed text
from system IME (fcitx5) as the replacement, Rich Edit inserts the new text at
the _ending_ character position of the current selection, instead of the
_starting_ character position.

Steps to reproduce:

1. Activate fcitx5 (Hangul).
2. Enter the following text: "[ABCXYZ]"
3. Select the following text: "ABC"
4. Compose a character.

Expected behaviour:

The composed character should replace "ABC".

Actual behaviour:

The text "ABC" is erased, but the newly composed character is inserted after
"Z", before "]".