Cherry-picks for the 4.0 branch (future 4.0.3) - 5th batch

[YuriSizov]

Final batch before building 4.0.3-stable.

• Two previous cherry-pick have been reverted.
  • Make EditorToaster's handler thread-safe #71670 required further changes, which aren't safe for a patch release.
  • Improve the UX of ViewportTexture in the editor #64388 causes a regression which needs to be fixed, so it's better to err on the side of caution and give it a bit more time to be tested in master.
• Several documentation changes and very safe fixes (including crashes) added.
• Changelog should be up to date.
• Still needs a version bump ahead of starting the build 🙃

[AThousandShips]

Godot-cpp was updated to match #76406 in godotengine/godot-cpp#1095, and seems the CI uses the master branch of godot-cpp unless I've missed something in there

[akien-mga]

We probably need this change in the 4.0 branch:

diff --git a/.github/workflows/linux_builds.yml b/.github/workflows/linux_builds.yml
index 44765ee32e..89e6f971a6 100644
--- a/.github/workflows/linux_builds.yml
+++ b/.github/workflows/linux_builds.yml
@@ -4,8 +4,8 @@ on:
 
 # Global Settings
 env:
-  # Only used for the cache key. Increment version to force clean build.
-  GODOT_BASE_BRANCH: master
+  # Used for the cache key, and godot-cpp checkout. Add version suffix to force clean build.
+  GODOT_BASE_BRANCH: 4.0
   SCONSFLAGS: verbose=yes warnings=extra werror=yes module_text_server_fb_enabled=yes
   DOTNET_NOLOGO: true
   DOTNET_CLI_TELEMETRY_OPTOUT: true
@@ -182,6 +182,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: godotengine/godot-cpp
+          ref: ${{ env.GODOT_BASE_BRANCH }}
           submodules: 'recursive'
           path: 'godot-cpp'
 

And only the second part in the master branch, for consistency.

[YuriSizov]

Yeah, I just arrived to the same conclusion. Will add a commit.

[akien-mga]

I made a PR as other files needed a fix too: #77204. But feel free to include that commit directly in this PR and supersede mine.

[YuriSizov]

Ah, then I'll just merge and rebase 👍 Thanks!

[akien-mga]

Thanks!