CKEditor 5 unable to paste into edit window with "Basic" formatting options

[izmeez]

Description of the bug

Using backdrop 1.27.0 preview with fresh install. Edit content such as about page. Copy some text from another app or browser tab or window and attempt to paste that content into the ckeditor 5 window. Nothing appears with either Ctrl-V or GUI context menu item: Paste.

Additional information

Add any other information that could help, such as:

• Backdrop CMS version: Backdrop 1.27.0 preview
• Web server and its version: Laragon
• PHP version: 8.1.10
• Database sever (MySQL or MariaDB?) and its version: 8.0.30
• Operating System and its version: Windows10
• Browser(s) and their versions: Firefox

[argiepiano]

I'm not able to reproduce - pasting is working fine, and it includes rich text as allowed. Backdrop 1.27.0-preview, CKE5, PHP 8.1.13. Sparkling clean install.

[stpaultim]

I spun up a test site with the preview release, using the Tugboat option on BackdropCMS.org - https://backdropcms.org/try-backdrop/dev

I edited the about page and easily pasted conent in from another document.

I also installed the preview release on a dev site that we are currently upgrading from Drupal 7. I then upgraded from CKEditor 4 to 5 and am able to cut and paste content into there as well.

@izmeez Any additional information to help us recreate the problem. Have you tried it on a different computer or with a different browser. Could it be OS or browser related?

[izmeez]

Thanks everyone for testing. I have tested with Brave (a chrome) browser and the paste works fine, so it appears to be a Firefox issue. I'll see what else I can find.

[izmeez]

On the same environment I installed TinyMCE editor and paste works fine.

I also found a CKEditor 5 documentation page, https://ckeditor.com/docs/ckeditor5/latest/features/pasting/paste-plain-text.html

that includes a demo edit window where the paste is supposed to work but doesn't when I'm using my Firefox browser.

It also doesn't work on the feature rich editor example page, https://ckeditor.com/docs/ckeditor5/latest/examples/builds-custom/full-featured-editor.html

[avpaderno]

I use Firefox, but I was able to edit https://master-qjwnbhjyafnuvhuqfuurctyqvkibjoer.tugboatqa.com/about and copy-paste text from two different sites. I was also able to copy text from https://ckeditor.com/docs/ckeditor5/latest/examples/builds-custom/full-featured-editor.html to https://ckeditor.com/docs/ckeditor5/latest/features/pasting/paste-plain-text.html.

[izmeez]

@kiamlaluno Thanks for update. Maybe one of my chosen plugins is the issue. I'll have to narrow it down.

[indigoxela]

@izmeez can you provide two things here to help us narrowing it down?

• A screenshot of your editor with toolbar
• The export of your basic text format (see description below)

Description:

• Go to /admin/config/development/configuration/single/export
• Select "Text formats"
• Then "Basic"

Copy that json content, and post here, wrapped in <pre> and </pre>.

[izmeez]

@indigoxela While I have my doubts it is a BD issue, here is the info you requested:

{
    "_config_name": "filter.format.filtered_html",
    "format": "filtered_html",
    "name": "Basic",
    "weight": 0,
    "editor": "ckeditor5",
    "editor_settings": {
        "image_upload": {
            "status": 1,
            "dimensions": {
                "max_width": "",
                "max_height": ""
            },
            "max_size": null,
            "scheme": "public",
            "directory": "inline-images"
        }
    },
    "filters": {
        "filter_url": {
            "weight": 0,
            "status": 1,
            "module": "filter",
            "settings": []
        },
        "filter_html": {
            "weight": 1,
            "status": 1,
            "module": "filter",
            "settings": []
        },
        "filter_autop": {
            "weight": 2,
            "status": 1,
            "module": "filter",
            "settings": []
        },
        "filter_image_caption": {
            "weight": 4,
            "status": 1,
            "module": "filter",
            "settings": []
        },
        "filter_image_align": {
            "weight": 4,
            "status": 1,
            "module": "filter",
            "settings": []
        },
        "filter_htmlcorrector": {
            "weight": 10,
            "status": 1,
            "module": "filter",
            "settings": []
        }
    },
    "cache": true,
    "status": 1
}

[izmeez]

Please don't waste anymore time on this. I should have tried this sooner: I setup a fresh install of Firefox 121.0 and it works just fine. I'm quite sure there must be something unique in my primary Firefox environment that caused this and maybe I will stumble upon it at some point. Sorry for the alarm, I am going to close this issue.