[Merge] lp:~fboucault/webbrowser-app/combo_box_better_ux into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

One minor glitch: when browsing to https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_optgroup and selecting any of the first three options, then opening the menu again, that option is the one selected by default. But that doesn’t work when selecting the fourth option ("Audi"). When opening the menu again, the first option is selected. And the menu doesn’t display all items, despite there being enough vertical space. I suppose this is due to section headers not being accounted for when calculating the height?
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https://code.launchpad.net/~fboucault/webbrowser-app/combo_box_better_ux/+merge/316571
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