Bug 250208

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