cefclient: Windows: Japanese IME popup is placed incorrectly with OSR

[magreenblatt]

Original report by Andrew Smith (Bitbucket: Andrew Smith).

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The Japanese IME popup is displayed on the bottom right side of the screen when the composition starts.

This only happens when using the offscreen rendering.

Steps:

• Run cefclient:

cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu

• Switch to Hiragana using Japanese IME

• Type ‘a'

The results are as shown in the image above. It seems like the issue is that the browser is not provided the character bounds until after the composition has started and so the calls to position the ime candidate window are not made until after the window has been shown. I just tested with the latest cef client - 100.0.22+g4a1240d+chromium-100.0.4896.88 / Chromium 100.0.4896.88.

Note: This issue does not happen when not using offscreen rendering (e.g. cefclient.exe --multi-threaded-message-loop --no-sandbox) presumably because the bounds are known earlier.

‌

[magreenblatt]

Issue #3321 was marked as a duplicate of this issue.

[magreenblatt]

This is something that needs to be fixed in the client, possibly with the assistance of new/modified CEF API.

[magreenblatt]

See also issue #3306

[magreenblatt]

Issue #2348 was marked as a duplicate of this issue.

[magreenblatt]

windows: cefclient: Fix crash when triggering IME popup (see issue #3313)

→ <<cset 9f7a59536c21 (bb)>>

[magreenblatt]

Testing with OSR at current master (M105), I am able to reproduce this issue when typing ‘a' in the search field with Japanese + Hiragana on first launch of cefclient only. It also reproduces with Chinese input on first launch (instructions from issue #3306). It does not reproduce (popup is correctly placed) on the 2nd+ time typing in the search field.

[magreenblatt]

Screenshot of incorrect placement attached.

[magreenblatt]

Original comment by Andrew Smith (Bitbucket: Andrew Smith).

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If you’re changing the title to the specific issue I was reporting then perhaps you might reopen 3321 since that is no longer related to what you might fix when you get to this one?

[magreenblatt]

windows: cefclient: Fix crash when triggering IME popup (see issue #3313)

→ <<cset 5074b14714c4 (bb)>>

[magreenblatt]

windows: cefclient: Fix crash when triggering IME popup (see issue #3313)

→ <<cset 75c6895fb532 (bb)>>

[magreenblatt]

If you’re changing the title to the specific issue I was reporting then perhaps you might reopen 3321 since that is no longer related to what you might fix when you get to this one?

Agreed and done.

[magreenblatt]

• changed kind from "bug" to "enhancement"
• changed title from "Windows IME popup displayed in wrong position when using offscreen rendering" to "Windows: Fix IME popup and selection issues with OSR"
• changed component from "Unclassified" to "Framework"

[magreenblatt]

• changed component from "Framework" to "SampleApps"
• changed kind from "enhancement" to "bug"
• changed priority from "major" to "minor"
• changed title from "Windows: Fix IME popup and selection issues with OSR" to "cefclient: Windows: Japanese IME popup is placed incorrectly with OSR"

[magreenblatt]

• set attachment to "japanese_input.png"