Bug 1954359

I guess the problem here is that Qt doesn't take care of "emoji" well. it just looks working as /a fallback font/ for generic family names on what you believe as a solution. Noto Emoji fonts isn't a sans-serif, nor serif, nor monospace. adding substitution rule for them is completely wrong.

That would be a bug in Qt I'd say.

Apparently this is the Qt bug report about it: https://bugreports.qt.io/browse/QTBUG-80434

I think it is okay to add "Noto Color Emoji" to emoji family,
but may be not good to add "Noto Color Emoji" to sans/serif/monospace family.

This could be a bug in Qt.

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Still an issue in Fedora 36.

See also https://pagure.io/fedora-kde/SIG/issue/194. We could maybe close that, or this, because I'm not sure it makes sense to have two reports for the same issue. There's a workaround/potential element of a fix listed on that page, too.

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*** Bug 2173935 has been marked as a duplicate of this bug. ***

Still valid currently, per https://bugzilla.redhat.com/show_bug.cgi?id=2173935 .

+3 in https://pagure.io/fedora-qa/blocker-review/issue/1060 , marking accepted Beta FE. But we only want a 'proper' fix, we tend to agree that the fontconfig hack is not the right way to do this.

*** Bug 2129299 has been marked as a duplicate of this bug. ***

Created attachment 1995251 [details]
Draft patch to support the color emoji in Qt5

This patch will cache the emoji font family name in the QFontconfigDatabase,
and add the emoji font family name to the fallback font list.

This code is similar to the Windows emoji code in Qt5.

FEDORA-2023-e430c01bb1 has been submitted as an update to Fedora 39. https://bodhi.fedoraproject.org/updates/FEDORA-2023-e430c01bb1

FEDORA-2023-3d9c4cbdd1 has been submitted as an update to Fedora 38. https://bodhi.fedoraproject.org/updates/FEDORA-2023-3d9c4cbdd1

(In reply to Peng Wu from comment #12)
> This patch will cache the emoji font family name in the QFontconfigDatabase,
> and add the emoji font family name to the fallback font list.
> 
> This code is similar to the Windows emoji code in Qt5.

Do you plan to submit your change to Qt upstream? We can carry the patch in Fedora, but it would be better to have it in upstream in the future.

FEDORA-2023-3d9c4cbdd1 has been pushed to the Fedora 38 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2023-3d9c4cbdd1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2023-3d9c4cbdd1

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2023-e430c01bb1 has been pushed to the Fedora 39 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2023-e430c01bb1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2023-e430c01bb1

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Okay, I will submit the change to Qt upstream for review.

With the testing update, I see a small improvement. Black and white simple emoji all seem to work now. Color emoji fall back to black and white and complex emoji decompose (e.g. 🤷‍♂️ is black and white "shrug" + "male symbol" symbols).

It's not a complete fix, unfortunately.

FYI the patch has been reverted in both Qt5 and Qt6 as people reported it completely broke their font rendering. We better backport it once it lands in upstream to be on the safe side.

I am seeing the same problem on fc38. Please see bug 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=2248773

It seems to happen on my laptop but not on my desktops (all running FC38 with all updates but having different graphics cards and processors). Downgrading to -3 solves the problem.

Sorry, just realized that my patch is wrong.

It seems Qt doesn't support the emoji sequence according to the comment in QTBUG-85744.

This can probably moved to qt6, right?

Yes. Since Qt5 is dead-ish now and KDE is on Qt6, we might as well.

Dropping useless F38 FE tags.

IIUC correctly this may be fixed now already in Qt 6.8.1 which is in Rawhide

(In reply to Jens Petersen from comment #26)
> IIUC correctly this may be fixed now already in Qt 6.8.1 which is in Rawhide

Yes, it's not fixed in Qt 6.8.1 itself, but I backported the fix from Qt 6.9 while doing Qt 6.8.1 update.

FEDORA-2024-0f34ea6c6c (dtk6core-6.0.24-1.fc41, dtk6gui-6.0.24-1.fc41, and 49 more) has been submitted as an update to Fedora 41.
https://bodhi.fedoraproject.org/updates/FEDORA-2024-0f34ea6c6c

FEDORA-2024-0f34ea6c6c has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-0f34ea6c6c`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-0f34ea6c6c

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2024-0f34ea6c6c has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-0f34ea6c6c`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-0f34ea6c6c

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2024-0f34ea6c6c has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-0f34ea6c6c`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-0f34ea6c6c

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2024-0f34ea6c6c (dtk6core-6.0.24-1.fc41, dtk6gui-6.0.24-1.fc41, and 55 more) has been pushed to the Fedora 41 stable repository.
If problem still persists, please make note of it in this bug report.

FEDORA-2024-d3aaa76962 (qt6-qtbase-6.8.1-6.fc41, qt6-qtmultimedia-6.8.1-3.fc41, and 1 more) has been submitted as an update to Fedora 41.
https://bodhi.fedoraproject.org/updates/FEDORA-2024-d3aaa76962

FEDORA-2024-d3aaa76962 has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-d3aaa76962`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-d3aaa76962

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2024-d3aaa76962 has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-d3aaa76962`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-d3aaa76962

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

(In reply to Jan Grulich from comment #27)
> Yes, it's not fixed in Qt 6.8.1 itself, but I backported the fix from Qt 6.9
> while doing Qt 6.8.1 update.

Thank you!

Backports for this issue introduced another issue, which is also now present in Qt 6.9 upstream. There are missing country flag emojis in Keyboard KCM. 

Upstream issue: https://bugreports.qt.io/browse/QTBUG-132377

FEDORA-2024-d3aaa76962 (qt6-qtbase-6.8.1-7.fc41, qt6-qtmultimedia-6.8.1-3.fc41, and 1 more) has been pushed to the Fedora 41 stable repository.
If problem still persists, please make note of it in this bug report.