[Webkit-unassigned] [Bug 236212] New: Safari/WebKit shouldn't learn input history for input method in private browsing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236212

            Bug ID: 236212
           Summary: Safari/WebKit shouldn't learn input history for input
                    method in private browsing mode
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m_kato at ga2.so-net.ne.jp
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Windows (Windows 10 20H1+) and Android (API 26+) have IME private mode not to learn input history for input method.
- IS_PRIVATE for Windows (https://docs.microsoft.com/en-us/windows/win32/api/inputscope/ne-inputscope-inputscope)
- IME_FLAG_NO_PERSONALIZED_LEARNING for Android. (https://developer.android.com/reference/android/view/inputmethod/EditorInfo#IME_FLAG_NO_PERSONALIZED_LEARNING)
- GTK_INPUT_HINT_PRIVATE for GTK4. (https://gitlab.gnome.org/GNOME/gtk/-/issues/2261)

So Firefox and Chrome use this flag in private browsing mode, so when using private browsing mode, IME doesn't learn user's input history. But Safari/macOS still learns input history of IME even if private browsing mode.

Safari/macOS shouldn't learn input history of IME even if private browsing mode like Chrome and Firefox. I believe that personal privacy is high priority as Apple, but this issue isn't better than Google, Mozilla and Microsoft.

Reference:
- https://bugs.chromium.org/p/chromium/issues/detail?id=958054
- https://bugzilla.mozilla.org/show_bug.cgi?id=1549394

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