Handle dropdowns (select html elements)

[domubpkm]

https://github.com/ubports/morph-browser/pull/273

Many thanks to ldubeuf @lduboeuf (with the review of UniversalSuperBox @UniSuperBox ) for spending a lot of time to solve this very disabling problem that no longer appears on the Dev channel (i don't know for RC). This is an important step for the good use of Morph-browser on a daily basis.

[thilov]

Absolutely, great work!

[Giiba]

Indeed! Morph just keeps getting better.

[kugiigi]

Awesome work but seems to be not implemented on webapps.

[domubpkm]

@kugiigi Maybe but works at least for some webapps, as those built with Webber. I noticed that.

From Balcy in the link above :

I think "simple" webapps (calling webapp-container with arguments in their .desktop file) do work, but apps with custom QML using Morph-Web as library don't.

[kugiigi]

@domubpkm Ah I see. I guess that's the case. I've only tested on the youtbe app I think. I wonder how it will take effect on those that simply uses WebEngineView from Morph.Web.