IssueTracker

Converting placeholders into arguments is the documented behavior: https://developer.android.com/reference/androidx/navigation/NavDestination.html#addDeepLink(java.lang.String)

What's missing is that NavDestination doesn't have any API for reading in types or applying that to deep links. We should move that logic from NavInflater to NavDestination so that both XML inflated NavDestinations and programmatically constructed NavDestinations have access to that type information.

no impact to nav editor, right?

No impact on the nav editor, but we should try to fix this before beta since this will impact developers parsing the arguments from deep links (ideally, they can use the same Args class).

This has been fixed in https://android-review.googlesource.com/835484 and will be available in Navigation 1.0.0-alpha09

Project: platform/frameworks/support
Branch: androidx-master-dev

commit fb1c82582399043b149eb2630f524c75de9c88dc
Author: Jelle Fresen <jellefresen@google.com>
Date:   Thu Aug 15 11:34:36 2019

    Disallow intercept, touch slop and canScroll in nestedPreScroll
   
    * Disallow intercept (requestDisallowInterceptTouchEvent(true))
    When scroll delta is consumed by dispatchNestedPreScroll, the parent
    should be requested not to intercept subsequent touch events, just as
    when scroll is consumed by the widget itself or dispatchNestedScroll.
   
    * Touch slop
    NestedScrollingChild implementations should only call
    dispatchNestedPreScroll after the delta x/y has exceeded the touch slop.
   
    * canScroll (canScrollHorizontally/canScrollVertically)
    The dx/dy values passed to dispatchNestedPreScroll should be zero if the
    child can't scroll in that direction.
   
    Fixed in:
    - RecyclerView
    - NestedScrollView
   
    Bug: 138668210
    Bug: 139530818
    Test: ./gradlew connectedCheck
    Change-Id: I85b327ad096fbbd204adb92f630770ec7fad5990

M       core/core/src/androidTest/java/androidx/core/widget/NestedScrollViewNestedScrollingChildTest.java
M       core/core/src/main/java/androidx/core/widget/NestedScrollView.java
M       recyclerview/recyclerview/src/androidTest/java/androidx/recyclerview/widget/RecyclerViewNestedScrolling3RequestDisallowInterceptTouchTest.java
M       recyclerview/recyclerview/src/androidTest/java/androidx/recyclerview/widget/RecyclerViewNestedScrollingChildTest.java
M       recyclerview/recyclerview/src/main/java/androidx/recyclerview/widget/RecyclerView.java

https://android-review.googlesource.com/1105373
https://goto.google.com/android-sha1/fb1c82582399043b149eb2630f524c75de9c88dc

1) N/A
2) Remove NestedScrollView
3) Was due to a bug in RecyclerView with pre-scroll, fix is on it's way

Correction, the fix is in. Will be released in the coming release of recyclerview (1.1.0-beta04)