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Fully support Per-Monitor DPI v2 in candidate window for Windows #1459

Description

@yukawa

Description

Candidate windows implemented in mozc_renderer currently does not fully support Per-Monitor (V2) DPI. Let's fix remaining issues.

Steps to reproduce

  1. Install Mozc for Windows
  2. Open Notepad then enable Mozc.
  3. Type something to show the candidate window.
  4. Change the display DPI in the system settings.

Expected behavior

The candidate window is scaled up/down accordingly.

Actual behavior

The candidate window remains to use the initial DPI.

Version or commit-id

395f9d7

Environment

  • OS: Windows 11 25H2

Additional context

This is one of the major remaining tasks of the following meta bug.

Activity

  1. self-assigned this
    on Apr 6, 2026
  2. added theissue type on Apr 6, 2026
  3. added a commit that references this issue on Apr 27, 2026
    20ceb25
  4. added a commit that references this issue on Apr 28, 2026
    fafbde9
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