[Webkit-unassigned] [Bug 191185] New: Viewport is not scrolled to the selection on typing in contentEditable or textarea

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191185

            Bug ID: 191185
           Summary: Viewport is not scrolled to the selection on typing in
                    contentEditable or textarea
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pkoszulinski at gmail.com
                CC: wenson_hsieh at apple.com

I think this is a recent regression because this started to be reported to us very recently (e.g. in https://github.com/ckeditor/ckeditor5/issues/1321). 

To reproduce (on iOS):

1. Open https://jsfiddle.net/hzkfdrgw/
2. Place the selection in the textarea. Press the enter a couple of times.
3. Scroll the viewport so the caret goes off screen.
4. Type something.

Expected behaviour: the viewport is scrolled to show the selection.

Actual behaviour: the viewport is not scrolled.

Screencast: http://sendvid.com/qzpnxe3h

Severity: This is a quite serious issue due the fact that is super hard to create a workaround for it that would work in mobile Safari due to Safari's broken viewport when the software keyboard is visible. My tests (https://github.com/ckeditor/ckeditor5/issues/1321#issuecomment-435330662) show that on all other browsers we can reliably show the selection by playing with `window.scrollTop`. But that algorithm doesn't work in mobile Safari. I'll be filling a separate bug report about the viewport.

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