With the check reached from the client's own runs right after login, the Steam client segfaulted
within seconds, four sessions out of four; the same build without the check (test/bisect-no-launch-check)
and the last build before it both reach Big Picture. Now every run that is not a game launch -
the client's probes, app id 0 - is left exactly as before. Each check logs one line.
Steam runs its graphics probe through every registered Proton at once after login, all in
compatdata/0. Prefix system32 links point into the Proton that set it up last, and the other
Protons' Wines, running outside Proton's pfx.lock, wrote their builtin DLLs through them into that
Proton's tree (device: GE's FEX DLLs became Proton Experimental's at session start).
- bannerlator-steam-compat: both wrappers (Valve's depot launcher and the third-party
bannerlator-proton-wrap) give a tool-0 run STEAM_COMPAT_DATA_PATH=.../compatdata/0-<tool>, and
before every other launch check the Proton's files against the app's desired.tsv and put back
anything that differs (same Proton build only), logging to reapplied.log.
- ComponentsManager writes desired.tsv plus unpacked copies of the packages in use into the
runtime after every change; the page and the drawer show 're-applied at launch'.
A Components entry under Desktop opens a page built like the driver pages: a
Proton drop-down, FEX / DXVK / VKD3D-Proton tabs, what is in use, the installed
rows (each Proton build's original bundle and the stored packages; tap to
swap in, trash to delete), downloads from the Nightlies -Linux releases behind
the refresh button, and Import .wcp.
The session drawer gets a fourth tab, Components, for quick swaps between
what is installed. A swap into the Proton a running game uses waits until the
game closes and is applied then (drawer refresh, or the main screen on resume).
ComponentsManager keeps the same package format, originals layout and state as
the Decky Components Manager plugin and takes its data over once. A swap clears
only the component's own DLLs, so files a Proton keeps beside them stay.
The three page dots between LB and RB become icons standing in a line in page order, as in
Steam's Quick Access Menu. The selected one steps forward (full size, bright, a soft glow in the
accent), the others step back to half size and fade, and the line leans a little toward the
selection; tapping or picking a tab with the pad, and LB / RB, turn the page as before. The
first page's heading becomes Display to match its icon.
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