[ChandraChaan]

Description

share_plus_windows_plugin.h declares a member with its class name in front of it:

static std::wstring SharePlusWindowsPlugin::Utf16FromUtf8(std::string string);

An extra qualification on a member declaration isn't valid C++. MSVC used to accept it in permissive mode, but apps that compile with /std:c++20 (which turns on /permissive-) fail with error C4596: 'Utf16FromUtf8': illegal qualified name in member declaration, so share_plus can't be built in those projects at all.

This removes the qualification. The definition in share_plus_plugin.cpp and every call site are unchanged, so there's no behaviour change. I checked the rest of the plugins' Windows headers and this was the only occurrence.

I verified the before and after with clang++ -std=c++20 -fsyntax-only on a reduced example: it reports "extra qualification on member" for the old line and accepts the new one. I don't have a Windows machine to run a full MSVC build, so a CI run on Windows would be welcome.

Related Issues

• Fix [Compile+SharePlus]: Illegal qualified name #3956

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

• No, this is not a breaking change.

[ChandraChaan]

The ios_integration_test job was cancelled after about 30 minutes while running the integration tests, before any result. This change only touches a Windows C++ header, and the same job was also cancelled on several other recent share_plus runs (including a dependabot update and a release branch). Could a maintainer re-run it when convenient? Thanks!