Don't show context menu on root folder

This is done by assigning a new context value to the tree item that doesn't match any command's when clause

Fixes #50

CHANGELOG.md

@@ -6,6 +6,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 ## Unreleased
 ### Fixed
 - Current working directory is not the same as when running programs with Brickman
+- Context menu shown on root folder in remote file browser
 ### Changed
 - Upload command remembers selected directory for each workspace
 

src/extension.ts

@@ -571,6 +571,7 @@ class DeviceTreeItem extends vscode.TreeItem {
 enum FileState {
     None = 'ev3devBrowser.file',
     Folder = 'ev3devBrowser.file.folder',
+    RootFolder = 'ev3devBrowser.file.folder.root',
     Executable = 'ev3devBrowser.file.executable'
 }
 
@@ -590,7 +591,12 @@ class File extends vscode.TreeItem {
         this.isDirectory = stats.isDirectory();
         if (this.isDirectory) {
             this.collapsibleState = vscode.TreeItemCollapsibleState.Collapsed;
-            this.contextValue = FileState.Folder;
+            if (this.parent) {
+                this.contextValue = FileState.Folder;
+            }
+            else {
+                this.contextValue = FileState.RootFolder;
+            }
         }
         else if (this.isExecutable) {
             this.contextValue = FileState.Executable;