https://bugs.kde.org/show_bug.cgi?id=527728

            Bug ID: 527728
           Summary: Under certain conditions, the Konsole preedit area
                    produces black text on a black background, making the
                    text unreadable.
    Classification: Applications
           Product: konsole
      Version First 26.08.2
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 197593
  --> https://bugs.kde.org/attachment.cgi?id=197593&action=edit
These are the relevant screenshots.

DESCRIPTION
When Konsole uses a dark theme and Neovim uses a light theme, attempting to
input Chinese in Normal mode with a block cursor results in the preedit area
having a white background with black text; in Insert mode with a line cursor,
inputting Chinese results in the preedit area having a black background with
black text, making the text unreadable at that point.

STEPS TO REPRODUCE
1. Configure Konsole to use a dark theme and Neovim to use a light theme.
2. Open Neovim in Konsole and switch to Insert mode so that the cursor is a
line cursor.
3. Start inputting Chinese via an IME and trigger the preedit area; observe
that the preedit area is black text on a black background, making the text
unreadable.

OBSERVED RESULT
The preedit area is black text on a black background, making the text
unreadable.

EXPECTED RESULT
The text should be readable. In this example, the preedit area could be black
text on a light background.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.8.1
KDE Frameworks Version: 6.31.0
Qt Version: 6.12.0
Konsole Version: 26.08.2
Neovim Version: 0.12.6

ADDITIONAL INFORMATION
When Konsole uses a dark theme and Neovim uses a dark theme, attempting to
input Chinese in Normal mode with a block cursor results in the preedit area
having a white background with black text; in Insert mode with a line cursor,
inputting Chinese results in the preedit area having a black background with
white text.

When Konsole uses a light theme, or Neovim uses only a block cursor (in this
case, Konsole can use either a light or a dark theme), black text on a black
background will not occur.

A user on the Arch Linux CN forum told me that this issue can also be
reproduced in Vim.

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