Memory Leak on Navigation due to references not being removed from the HashMap

[kraigjacobson]

Environment

• CLI: 8.0.2
• Cross-platform modules:
• Android Runtime: 8.0.0
• iOS Runtime (if applicable):
• Plugin(s):

Describe the bug
When navigating the old fragments are still being referenced in the HashMap so the Garbage Collector doesn't collect them causing a memory leak.

When the navigation's 'clearHistory: true' the backstack is emptied properly but the memory leak remains.
When 'clearHistory: false' you can see all the old pages still in the backstack with different Id names even if they are the same page.

To Reproduce
ns create my-drawer-js --template @nativescript/template-drawer-navigation
Open up the profiler in Android Studio
Go to Memory and start a new profiling session
Navigate to a different page in the template app
Go back to profiler and Dump Java Heap

Click the Leaks link

Click the FragmentClass

Click the Instance

Click the References Tab and check the 'Show nearest GC root only' Option

The FragmentClass instance can't be released because of the references in the HashMap I believe.

This leak is also caught using leak canary

Expected behavior
Fragments should be getting completely removed from memory

Sample project
I used the most vanilla template I could to make sure issues weren't coming from frameworks or plugins
https://www.npmjs.com/package/@nativescript/template-drawer-navigation

Additional context

[farfromrefug]

@kraigjacobson did you try to force a callof GC? Maybe the the gc was not triggered yet

[triniwiz]

@kraigjacobson can you try this on the latest runtime and latest core version, I believe this was fixed.