[Merge] lp:~ahayzen/webbrowser-app/migrate-to-tabs-component into lp:webbrowser-app/staging

[Andrew Hayzen]

1) When closing a tab, I’m seeing the following warning:

TabsBar.qml:57: TypeError: Cannot read property 'localIcon' of undefined


FIXED

2) QQmlContext errors when there are enough tabs open to cause some to be hidden

I've fixed this in the ubuntu-ui-extras, what was happening was at application startup, the loader is set to start loading a component but while it is doing this in async the tab is destroyed (as it is out of view in the listview) and then when the component is complete there is no context for it to go to. So now when the tab is destroyed it unsets the loader source to prevent it from performing the load. Please test with the following branch: https://code.launchpad.net/~ahayzen/ubuntu-ui-extras/fix-context-errors-for-unloaded-tabs/+merge/317364
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https://code.launchpad.net/~ahayzen/webbrowser-app/migrate-to-tabs-component/+merge/312340
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