Deploy debug instances to "RoslynDev" instead of "FSharpDev" hive? (#3070)

* Update VisualFSharpOpenSource.csproj

* Update VisualFSharpFull.csproj

* Update DEVGUIDE.md

DEVGUIDE.md

@@ -111,7 +111,7 @@ Note: if you face this error [#2351](https://github.com/Microsoft/visualfsharp/i
 
 Or hard crash on launch ("Unknown Error"), delete these folders:
 
-* `%localappdata%\Microsoft\VisualStudio\15.0_(some number here)FSharpDev`
+* `%localappdata%\Microsoft\VisualStudio\15.0_(some number here)RoslynDev`
 * `%localappdata%\Microsoft\VisualStudio\15.0_(some number here)`
 
 #### [Optional] Install the Visual F# IDE Tools  (Windows Only)
@@ -138,9 +138,14 @@ Restart Visual Studio, it should now be running your freshly-built Visual F# IDE
 
 #### [Optional] F5 testing of local changes
 
-To test your changes locally _without_ overwriting your default installed F# tools, set the `VisualFSharp\Vsix\VisualFSharpOpenSource`
-project as the startup project.  When you hit F5 a new instance of Visual Studio will be started in the `FSharpDev` hive with your
-changes, but the root (default) hive will remain untouched.
+To test your changes locally _without_ overwriting your default installed Visual F# tools, set the `VisualFSharp\Vsix\VisualFSharpOpenSource`
+project as the startup project.  When you hit F5 a new instance of Visual Studio will be started in the `RoslynDev` hive with your
+changes, but the root (default) hive will remain untouched. You can also start this hive automatically using
+
+    devenv.exe /rootsuffix:RoslynDev
+    
+Because this uses the "RoslynDev" hive you can simultaneously test changes to an appropriate build of Roslyn binaries.
+
 
 #### [Optional] Rapid deployment of incremental changes to Visual F# IDE Tools components
 

vsintegration/Vsix/VisualFSharpFull/VisualFSharpFull.csproj

@@ -43,7 +43,7 @@
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <OutputType>Library</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
-    <VSRootSuffix>FSharpDev</VSRootSuffix>
+    <VSRootSuffix>RoslynDev</VSRootSuffix>
     <UseCodebase>true</UseCodebase>
     <DeployExtension Condition=" '$(DeployExtension)' == '' and ('$(AppVeyor)' != '' or '$(HUDSON_COOKIE)' != '' or '$(UsingMicrobuild)' != '') ">False</DeployExtension>
     <DeployExtension Condition=" '$(DeployExtension)' == '' and '$(AppVeyor)' == '' and '$(HUDSON_COOKIE)' == '' and '$(UsingMicrobuild)' == '' ">True</DeployExtension>
@@ -340,4 +340,4 @@
       </FilesToSign>
     </ItemGroup>
   </Target>
-</Project>
+</Project>

vsintegration/Vsix/VisualFSharpOpenSource/VisualFSharpOpenSource.csproj

@@ -43,7 +43,7 @@
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <OutputType>Library</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
-    <VSRootSuffix>FSharpDev</VSRootSuffix>
+    <VSRootSuffix>RoslynDev</VSRootSuffix>
     <UseCodebase>true</UseCodebase>
     <DeployExtension Condition=" '$(DeployExtension)' == '' and ('$(AppVeyor)' != '' or '$(HUDSON_COOKIE)' != '' or '$(UsingMicrobuild)' != '') ">False</DeployExtension>
     <DeployExtension Condition=" '$(DeployExtension)' == '' and '$(AppVeyor)' == '' and '$(HUDSON_COOKIE)' == '' and '$(UsingMicrobuild)' == '' ">True</DeployExtension>
@@ -339,4 +339,4 @@
       </FilesToSign>
     </ItemGroup>
   </Target>
-</Project>
+</Project>