GMail webapp keyboard hide and seek

Status changed to 'Confirmed' because the bug affects multiple users.

Something (I don’t know what yet) appears to be briefly stealing focus from the webview when the "Compose" button is tapped.

I monitor changes to Window.activeFocusItem and I’m seeing it change twice, although the value of the activeFocusItem is always the webview (if activeFocusItemChanged is emitted, there must be another item that is getting the active focus in between though).

I cannot reproduce the issue with a plain oxide WebView inside a MainView, so there is something that is webbrowser-app/webapp-container specific.

I instrumented oxide to be notified on focusInEvent() and focusOutEvent() on the webview, and when composing a new message neither is emitted (as expected). Still the QML window reports that its activeFocusItem has changed.

The QML window reporting that its activeFocusItem has changed without it actually changing is most likely due to the workaround for bug #1323743 in oxide. This should be harmless.

Note that the problem is not observed when changing the UA string for gmail to that of chrome on android, e.g.:

    Mozilla/5.0 (Linux; Android 4.4.2; Nexus 10 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.108 Safari/537.36

This doesn’t solve the issue though, because the UA string we expose is based on screen size only, so we don’t differentiate between a 10" tablet and a desktop computer.

When pressing the compose button, I’m seeing RenderViewImpl::focusedNodeChanged() being called three times:
 1) [null → div]
 2) [div → textarea(to:)]
 3) [textarea(to:) → null]

If I then tap the "Subject:" field, RenderViewImpl::focusedNodeChanged() is called only once: [null → input(subject:)].

The text area initially gets focus, as expected, but looses it right away, for a reason that still escapes me.
It looks like it’s not touch-friendly.

With the GMail desktop UI, resizing the window causes it to remove focus from the input elements in the compose UI - you can reproduce this with the GMail webapp on a desktop.

I suspect this is relevant, given that the webapp is resized on the tablet when the OSK is displayed

And the same behaviour happens with GMail in Chrome/Desktop

Still happening on Frieza's rc-proposed, always reproducible in portrait mode:

current build number: 171
device name: frieza
channel: ubuntu-touch/rc-proposed/bq-aquaris-pd.en
last update: 2016-08-18 09:03:34
version version: 171
version ubuntu: 20160818
version device: 20160809.0
version custom: 20160805--42-20-vivid