Add Open File in Solution context menu item

Added to `GitHub` submenu, but this isn't very discoverable.

Author: jcansdale

src/GitHub.Exports/Settings/PkgCmdID.cs

@@ -17,6 +17,7 @@ public static class PkgCmdIDList
         public const int createGistCommand = 0x400;
         public const int openLinkCommand = 0x100;
         public const int copyLinkCommand = 0x101;
+        public const int openFileInSolutionCommand = 0x102;
         public const int githubCommand = 0x320;
         public const int helpCommand = 0x321;
         public const int blameCommand = 0x500;

src/GitHub.VisualStudio/GitHub.VisualStudio.vsct

@@ -191,6 +191,16 @@
           <ButtonText>Blame</ButtonText>
         </Strings>
       </Button>
+      
+      <Button guid="guidContextMenuSet" id="openFileInSolutionCommand" type="Button">
+        <Icon guid="guidImages" id="logo" />
+        <CommandFlag>IconIsMoniker</CommandFlag>
+        <CommandFlag>DefaultInvisible</CommandFlag>
+        <CommandFlag>DynamicVisibility</CommandFlag>
+        <Strings>
+          <ButtonText>Open File in Solution</ButtonText>
+        </Strings>
+      </Button>
 
     </Buttons>
 
@@ -232,6 +242,9 @@
       <Parent guid="guidContextMenuSet" id="idGitHubContextSubMenuGroup"/>
     </CommandPlacement>
 
+    <CommandPlacement guid="guidContextMenuSet" id="openFileInSolutionCommand" priority="0x104">
+      <Parent guid="guidContextMenuSet" id="idGitHubContextSubMenuGroup"/>
+    </CommandPlacement>
 
     <!-- Standard toolbar commands -->
     <CommandPlacement guid="guidGitHubToolbarCmdSet" id="backCommand" priority="0x100">
@@ -320,9 +333,9 @@
       <IDSymbol name="idGitHubContextSubMenuGroup" value="0x1002" />
       <IDSymbol name="openLinkCommand" value="0x100" />
       <IDSymbol name="copyLinkCommand" value="0x101"/>
+      <IDSymbol name="openFileInSolutionCommand" value="0x0102" />
       <IDSymbol name="idCreateGistCommand" value="0x0400" />
       <IDSymbol name="idBlameCommand" value="0x0500" />
-
     </GuidSymbol>
 
     <GuidSymbol name="GUID_XAML_EDITOR" value="{4C87B692-1202-46AA-B64C-EF01FAEC53DA}">

src/GitHub.VisualStudio/Views/GitHubPane/PullRequestDetailView.xaml.cs

@@ -242,8 +242,11 @@ void EnableNavigateToEditor(IVsTextView textView, IPullRequestFileNode file)
         {
             var commandGroup = VSConstants.CMDSETID.StandardCommandSet2K_guid;
             var commandId = (int)VSConstants.VSStd2KCmdID.RETURN;
-            var dispatcher = new TextViewCommandDispatcher(textView, commandGroup, commandId);
-            dispatcher.Exec += async (s, e) => await DoOpenLiveFile(file);
+            new TextViewCommandDispatcher(textView, commandGroup, commandId).Exec += async (s, e) => await DoOpenLiveFile(file);
+
+            var contextMenuCommandGroup = new Guid(Guids.guidContextMenuSetString);
+            var goToCommandId = PkgCmdIDList.openFileInSolutionCommand;
+            new TextViewCommandDispatcher(textView, contextMenuCommandGroup, goToCommandId).Exec += async (s, e) => await DoOpenLiveFile(file);
         }
 
         void ShowErrorInStatusBar(string message, Exception e = null)

src/GitHub.VisualStudio/Views/GitHubPane/TextViewCommandDispatcher.cs

@@ -39,6 +39,18 @@ int IOleCommandTarget.Exec(ref Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt
 
         int IOleCommandTarget.QueryStatus(ref Guid pguidCmdGroup, uint cCmds, OLECMD[] prgCmds, IntPtr pCmdText)
         {
+            if (pguidCmdGroup == commandGroup)
+            {
+                if (prgCmds != null && cCmds == 1)
+                {
+                    if (prgCmds[0].cmdID == commandId)
+                    {
+                        prgCmds[0].cmdf = (uint)OLECMDF.OLECMDF_SUPPORTED | (uint)OLECMDF.OLECMDF_ENABLED;
+                        return VSConstants.S_OK;
+                    }
+                }
+            }
+
             return next?.QueryStatus(ref pguidCmdGroup, cCmds, prgCmds, pCmdText) ?? 0;
         }