[Webkit-unassigned] [Bug 250208] New: [GTK] delete surrounding text doesn't seem to work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250208

            Bug ID: 250208
           Summary: [GTK] delete surrounding text doesn't seem to work
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eb1 at sil.org
                CC: bugs-noreply at webkitgtk.org

It seems that deleting surrounding text doesn't work when typing with an IME that makes use of surrounding text, e.g. ibus-engine-keyman (https://keyman.com).

Ubuntu 22.04 with Gnome Shell and X11, but also in other Ubuntu versions.

To reproduce:

- install Keyman 16.x together with the patched version of ibus from https://launchpad.net/~keymanapp/+archive/ubuntu/keyman-beta
- start km-config and download Vietnamese Telex keyboard
- in km-config in the Download dialog, switch to Vietnamese Telex keyboard and type `boo`
- alternatively, start WebKit minibrowser, load a webpage with a textfield (e.g. https://www.editpad.org/) and type `boo` (with Vietnamese Telex keyboard active)

Expected result:
`bô`

Actual result:
`boô`

Note that in the minibrowser things work correctly in the address bar, but not on a webpage.

When typing the second `o` Keyman sends the delete-surrounding signal to delete the first `o` (one character to the left of the IP) and then adds the `ô`.

Maybe relevant: 
https://bugs.webkit.org/show_bug.cgi?id=205716
https://bugs.webkit.org/show_bug.cgi?id=206352

See also: https://github.com/keymanapp/keyman/issues/7971

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