ContextMenus don't automatically adapt according to input device

[Splitwirez]

Long story short, Fluent.Ribbon ContextMenus don't do this:

Here's the current state of my efforts to create a solution to this: TouchableContextMenuBehavior attempt for Fluent Ribbon.zip Note that this stuff wasn't originally written for Fluent.Ribbon, and has not been adapted for use with it at all (other than removing a handful of attached properties related to other stuff)

Currently, only three real problems remain:

• The menu doesn't adapt its size as intended the first time it is opened
• This whole thing would probably fall apart if the menu is moved from one element to another, or if its PlacementTarget and the control whose ContextMenu property it occupies become different
• The menu seemingly occasionally opens in the wrong size (although this may just be my head messing with me, idk for sure) I've tried everything I can think of to resolve problem 1 to no avail, but as for problem 2...I don't even know where to start. Problem 3 may or may not actually exist. If these issues were resolved, I'm fairly certain we'd have a pretty robust implementation of this size-changing capability.

Additionally, the behaviour requires a small amount of restyling for both the ContextMenu and MenuItems in order to behave as intended (the former to set IsContextMenuTouchable to true, thereby attaching the behaviour, and the latter to actually resize the MenuItems according to a binding to the ContextMenu's OpenedWithTouch property (I did this using a DataTrigger and enlarged Padding). No idea if either of these styling requirements can be eliminated, but if it is possible, I think that would be ideal.

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Environment

• Fluent.Ribbon vN/A, I haven't actually tested these with Fluent.Ribbon
• Windows 8.1
• .NET Framework 4.7.2, but could probably be backported easily if needed, idk