M7: avoid Windows GNU UIA crash

.cargo/config.toml

@@ -3,5 +3,12 @@
 [env]
 CRAFT_FONTS_DIR = { value = "../craft-fonts", relative = true }
 
+# The Windows UI Automation adapter can be asked about a node that disappeared in the
+# same frame. On MinGW, converting that HRESULT through windows-result's thread COM
+# error-info path has crashed in GetErrorInfo. Keep the HRESULT without that extra
+# COM lookup; this leaves the AccessKit tree and screen-reader support enabled.
+[target.x86_64-pc-windows-gnu]
+rustflags = ["--cfg=windows_slim_errors"]
+
 [alias]
 xtask = "run -q -p xtask --"

apps/figcraft/build.rs

@@ -1,6 +1,7 @@
 //! Windows: embed the icon and version info in figcraft.exe and size its main thread's stack
 //! (no-op elsewhere).
 fn main() {
+    println!("cargo::rustc-check-cfg=cfg(windows_slim_errors)");
     println!("cargo::rerun-if-changed=../../assets/app-icon/figcraft.ico");
     let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
     if target_os == "windows" {

apps/figcraft/src/main.rs

@@ -15,6 +15,11 @@
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![cfg_attr(all(target_os = "windows", not(debug_assertions)), windows_subsystem = "windows")]
 
+// A missing Windows GNU flag re-enables the COM error-info lookup that crashes while AccessKit
+// reports a removed UI Automation node. Catch build configurations that drop the workaround.
+#[cfg(all(target_os = "windows", target_env = "gnu", not(windows_slim_errors)))]
+compile_error!("Windows GNU builds must set windows_slim_errors to keep UI Automation responsive");
+
 #[cfg(target_os = "macos")]
 mod apple_events;
 mod args;