HamburgerMenu: Add HamburgerVisibility property and fixup tab navigation

[lukasf]

Currently, there is no way to hide the hamburger button and fully show the content without any overlay. We can hide the menu bar by setting DisplayMode to Overlay, but the button is always visible. As a workaround, I have set the HamburgerHeight to zero. But the button is still there and messes up tab navigation. Adding a HamburgerVisibility property will allow us to hide the button itself.

Scenario: Show image in fullscreen mode in an image viewer app, with no controls on screen.

Additionally, I have found that the SplitView control in the control template has tab focus enabled. This does not make sense, we should add IsTabStop="False".

I could create a PR for this if you like.

[deltakosh]

Hey @lukasf!

Most of the time I will not accept a PR for the HamburgerMenu (as the platform team plans to ship one) but for this specific one as it is a small one and it is not easy to do with templating, I'm ok

[lukasf]

Thank you @deltakosh. I will try to make a PR within the next few days.

[lukasf]

Created PR #1020.

[lukasf]

Closing this: PR merged...