[BUG] PM confused about state of applied patch

[nephros]

SailfishOS VERSION (Settings → About product → Build): 4.2

HARDWARE (Settings → About product → Manufacturer & Product name): Xperia 10 DS

PATCHMANAGER VERSION (Settings → Patchmanager → [Top pulley] About): 3.1

BUG DESCRIPTION

PM sometimes can not apply a patch because it is already applied, but PM doesn't realize it. So in effect it trips over its own preload trick.

STEPS TO REPRODUCE

1. download and apply a patch which needs "restart services" (<-- is that last part required? unclear)
2. apply that patch via PM, restart e.g. lipstick
3. unapply that patch, don't "restart services
4. close PM
5. update patchmanager to a different version/rpm
6. try to apply that same patch (it shows as unapplied, although on the system it is applied still)

--> patch applying fails, as the target files are already patched

ADDITIONAL INFORMATION

Not 100% sure this is how to trigger it.

It sometimes happens while I multi-task patch development and PM development. (So I both edit patches on the fly, and update development versions of PM itself).

But it's some combination of unapplying, updating either the patch source itself or PM, and restarts.