fix: Use upstream webm-sys, update toolchains

Update the WebM dependency chain to upstream 2.2 and use Rust 1.94 since upstream webm-sys uses edition=2024.

Sciter is kept on nightly due to a feature gate for thiscall still being present

.github/workflows/bridge.yml

@@ -6,10 +6,11 @@ on:
   workflow_call:
 
 env:
-  CARGO_EXPAND_VERSION: "1.0.95"
-  FLUTTER_VERSION: "3.22.3"
-  FLUTTER_RUST_BRIDGE_VERSION: "1.80.1"
-  RUST_VERSION: "1.75" # https://github.com/rustdesk/rustdesk/discussions/7503
+  CARGO_EXPAND_VERSION: '1.0.95'
+  FLUTTER_VERSION: '3.22.3'
+  FLUTTER_RUST_BRIDGE_VERSION: '1.80.1'
+  # webm 2.2.0 uses 2024-edition let-chains; keep bridge generation on current stable
+  RUST_VERSION: '1.94.0'
 
 jobs:
   generate_bridge:
@@ -21,7 +22,7 @@ jobs:
           - {
               target: x86_64-unknown-linux-gnu,
               os: ubuntu-22.04,
-              extra-build-args: "",
+              extra-build-args: '',
             }
     steps:
       - name: Checkout source code
@@ -53,7 +54,7 @@ jobs:
         with:
           toolchain: ${{ env.RUST_VERSION }}
           targets: ${{ matrix.job.target }}
-          components: "rustfmt"
+          components: 'rustfmt'
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -69,7 +70,7 @@ jobs:
       - name: Install flutter
         uses: subosito/flutter-action@v2
         with:
-          channel: "stable"
+          channel: 'stable'
           flutter-version: ${{ env.FLUTTER_VERSION }}
           cache: true
 

.github/workflows/flutter-build.yml

@@ -18,9 +18,10 @@ on:
 # in this file!
 
 env:
-  SCITER_RUST_VERSION: "1.75" # https://github.com/rustdesk/rustdesk/discussions/7503, also 1.78 has ABI change which causes our sciter version not working, https://blog.rust-lang.org/2024/03/30/i128-layout-update.html
-  RUST_VERSION: "1.75" # sciter failed on m1 with 1.78 because of https://blog.rust-lang.org/2024/03/30/i128-layout-update.html
-  MAC_RUST_VERSION: "1.81" # 1.81 is requred for macos, because of https://github.com/yury/cidre requires 1.81
+  SCITER_RUST_VERSION: "1.94.0" # use current stable; webm 2.2.0 relies on 2024-edition let-chains stabilized after 1.85
+  SCITER_X86_NIGHTLY_RUST_VERSION: "nightly" # dyn_x86 still has a stale #![feature(abi_thiscall)] attribute, so this one job must stay on nightly until upstream removes it
+  RUST_VERSION: "1.94.0" # use current stable; webm 2.2.0 relies on 2024-edition let-chains stabilized after 1.85
+  MAC_RUST_VERSION: "1.94.0" # keep >=1.81 for cidre; current stable also satisfies the newer webm floor
   CARGO_NDK_VERSION: "3.1.2"
   SCITER_ARMV7_CMAKE_VERSION: "3.29.7"
   SCITER_NASM_DEBVERSION: "2.15.05-1"
@@ -321,7 +322,7 @@ jobs:
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@v1
         with:
-          toolchain: nightly-2023-10-13-${{ matrix.job.target }} # must use nightly here, because of abi_thiscall feature required
+          toolchain: ${{ env.SCITER_X86_NIGHTLY_RUST_VERSION }}-${{ matrix.job.target }} # dyn_x86 still declares #![feature(abi_thiscall)] even though thiscall itself is stable
           targets: ${{ matrix.job.target }}
           components: "rustfmt"
 

.github/workflows/playground.yml

@@ -7,7 +7,7 @@ on:
   workflow_dispatch:
 
 env:
-  RUST_VERSION: "1.75" # https://github.com/rustdesk/rustdesk/discussions/7503
+  RUST_VERSION: "1.94.0" # use current stable; webm 2.2.0 relies on 2024-edition let-chains stabilized after 1.85
   CARGO_NDK_VERSION: "3.1.2"
   LLVM_VERSION: "15.0.6"
   FLUTTER_VERSION: "3.22.2"