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* Fix [the Samsung Keyboard Korean Cheonjiin layout
bug](https://github.com/emilk/egui/pull/7967#issuecomment-4098503570)
* Partially fix (does not close) #8046
* Supersedes #7914
* Supersedes #8047
* Related: #8068
* Related: #7983
* Related: #8078
* [x] I have followed the instructions in the PR template
This PR reworks the text input handling logic in eframe's web
integration, primarily in `text_agent.rs`.
It also adds a new `ImeEvent::DeleteSurrounding` variant, along with the
corresponding handling logic in `egui` to support the changes.
## Fix: Samsung Keyboard Cheonjiin issue
This PR fixes a bug reported by @rustbasic when using Samsung Keyboard's
Cheonjiin Korean layout.
Since Samsung Keyboard is only available on Samsung devices, I wasn't
able to verify it myself. The fix is based on @rustbasic's testing and
confirmation.
The root cause is that the layout relies on the preceding text to
correctly handle batchim composition. Previously, the text agent eagerly
cleared the text input after every IME composition, removing the context
too early. This PR makes that cleanup more conservative, preserving the
text when it may still be needed.
My understanding is that this is a quirk specific to Samsung Keyboard:
The IME reports that composition has finished even though it is
effectively still active and the composed text may continue to change.
## Fix: Keystrokes resetting keyboard layout (numpad/symbols/etc.)
Partially fixes #8046.
Previously, keystrokes would cause the on-screen keyboard to switch back
to its primary layout.
One remaining issue is that tapping within the active `TextEdit` to
reposition the cursor still resets the keyboard to its primary layout.
## About text suggestions
I originally planned to include text suggestion support in this PR
because #8068 implemented it.
However, adding text suggestion support would broaden the scope of this
PR, so I think it is better addressed in a separate PR.
For reference, [the reverted
implementation](8a4f70859c)
works fine on Android (Gboard), but not on iOS (iPadOS 17 + SwiftKey).
