[Possible improvement] Persist host paths for reverse mapping

[AnrDaemon]

Type: Bug?

I've stumbled upon a problem that, while understandable after investigation, could use an improvement.

My setup had included the following path mappings:

"pathMappings": {
    "/home/user/project": "${workspaceFolder}",
    "/home/user/project/app/admin/func/": "${workspaceFolder}/app/func/"
}

The project had a symlink from ~/app/admin/func to app/func at one point, thus ~/app/func/func.php and ~/app/admin/func/func.php were the same file.
The symlink was made obsolete months ago and when I were doing cleanup of my dev. VM last week, I've removed it for good.
After that, I've found that I'm unable to install breakpoints inside the ~/app/func/ directory. Even when I have a debug session in progress, and all paths are known to extension, setting breakpoint in the current file marks it as unresolved.
Meditating over xdebug communication log immediately led me to the launch.json pathMappings setting, indeed, but I think this area could be improved from extension's side.

Extension version: 1.29.0
VS Code version: Code 1.73.0 (8fa188b2b301d36553cbc9ce1b0a146ccb93351f, 2022-11-01T15:34:06.111Z)
OS version: Windows_NT x64 10.0.19045
Modes:
Sandboxed: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (8 x 3408)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_renderer: enabled_on video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off
Load (avg)	undefined
Memory (System)	15.92GB (8.94GB free)
Process Argv	--folder-uri file:///c%3A/Users/Admin/Documents/hk/invapi-php
Screen Reader	no
VM	0%