Set useGlobalMono 'auto' meaning back to 'never' (#4130)

Author: JoeRobich

CHANGELOG.md

@@ -1,5 +1,6 @@
-## Known Issues in 1.23.4
+## Known Issues in 1.23.5
 
+* For Mono-based development (e.g. Unity) that requires full .NET framework, you need to set `"omnisharp.useGlobalMono": "always"`. This is needed until Mono [upgrades their bundled MSBuild version](https://github.com/mono/mono/issues/20250)
 * Known limitations with the preview Razor (cshtml) language service to be addressed in a future release:
   * Only ASP.NET Core projects are supported (no support for ASP.NET projects)
   * Limited support for formatting
@@ -10,7 +11,10 @@
 * Renaming symbol fails within a file that had recently been renamed without saving changes.
   * As a workaround, make an edit within the file before using Rename Symbol.
 
-## 1.23.4 (Not yet released)
+## 1.23.5 (Not yet released)
+* Set meaning of UseGlobalMono "auto" to "never" since Mono 6.12.0 still ships with MSBuild 16.7 (PR: [#4130](https://github.com/OmniSharp/omnisharp-vscode/pull/4130))
+
+## 1.23.4 (October, 19, 2020)
 * Use incremental changes to update language server (PR: [#4088](https://github.com/OmniSharp/omnisharp-vscode/pull/4088))
 * Set meaning of UseGlobalMono "auto" to "always" now that Mono 6.12.0 ships with MSBuild 16.8 (PR: [#4115](https://github.com/OmniSharp/omnisharp-vscode/pull/4115))
 * Updated OmniSharp to 1.37.3

README.md

@@ -25,7 +25,10 @@ The C# extension is powered by [OmniSharp](https://github.com/OmniSharp/omnishar
 The .NET 5 SDK requires version 16.8 of MSBuild.
 
 For Windows users who have Visual Studio installed, this means you will need to be on the latest Visual Studio 16.8 Preview.
-For MacOS and Linux users who have Mono installed, this means you will need to be on the latest stable Mono (6.12.0).
+For MacOS and Linux users who have Mono installed, this means you will need to set `omnisharp.useGlobalMono` to `never` until a version of Mono ships with MSBuild 16.8.
+
+## What's new in 1.23.5
+-   Set meaning of UseGlobalMono "auto" to "never" since Mono 6.12.0 still ships with MSBuild 16.7 (PR: [#4130](https://github.com/OmniSharp/omnisharp-vscode/pull/4130))
 
 ## What's new in 1.23.4
 -   Use incremental changes to update language server (PR: [#4088](https://github.com/OmniSharp/omnisharp-vscode/pull/4088))

src/omnisharp/OmniSharpMonoResolver.ts

@@ -46,7 +46,9 @@ export class OmniSharpMonoResolver implements IMonoResolver {
             return monoInfo;
         }
         else if (options.useGlobalMono === "auto" && isValid) {
-            return monoInfo;
+            // While waiting for Mono to ship with a MSBuild version 16.8 or higher, we will treat "auto"
+            // as "Use included Mono".
+            // return monoInfo;
         }
 
         return undefined;

test/unitTests/omnisharp/OmniSharpMonoResolver.test.ts

@@ -24,7 +24,7 @@ suite(`${OmniSharpMonoResolver.name}`, () => {
     const higherMonoVersion = "6.6.0";
 
     // Sets the meaning of UseGlobalMono "auto". When false, "auto" means "never".
-    const autoMeansAlways = true;
+    const autoMeansAlways = false;
 
     const getMono = (version: string) => async (env: NodeJS.ProcessEnv) => {
         getMonoCalled = true;