Extension - File Utils - 'Duplicate' command fails

[bryphe]

Pulling out from #1058 (thanks @mabasic!)

The Duplicate command in the file-utils extension fails. Looking at the log, I see this failure:

[ERROR] [ 4.018s] Oni2.Extension.ClientStore : {"$isError":true,"name":"Error","message":"Contributed command 'fileutils.duplicateFile' does not exist.","stack":"Error: Contributed command 'fileutils.duplicateFile' does not exist.\n\tat ExtHostCommands.$executeContributedCommand (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/api/common/extHostCommands.js:174:39)\n\tat RPCProtocol._doInvokeHandler (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/common/rpcProtocol.js:341:27)\n\tat RPCProtocol._invokeHandler (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/common/rpcProtocol.js:326:45)\n\tat RPCProtocol._receiveRequest (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/common/rpcProtocol.js:253:32)\n\tat RPCProtocol._receiveOneMessage (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/common/rpcProtocol.js:181:26)\n\tat /tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/common/rpcProtocol.js:65:52\n\tat Emitter.fire (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/common/event.js:479:38)\n\tat BufferedEmitter.fire (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:375:35)\n\tat /tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/workbench/services/extensions/node/extensionHostProcessSetup.js:146:41\n\tat Emitter.fire (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/common/event.js:479:38)\n\tat BufferedEmitter.fire (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:375:35)\n\tat PersistentProtocol._receiveMessage (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:654:41)\n\tat /tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:510:83\n\tat Emitter.fire (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/common/event.js:479:38)\n\tat ProtocolReader.acceptChunk (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:189:37)\n\tat /tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/common/ipc.net.js:158:61\n\tat Socket.listener (/tmp/.mount_Onivim4hx97Y/usr/share/node/node_modules/@onivim/vscode-exthost/out/vs/base/parts/ipc/node/ipc.net.js:17:40)\n\tat Socket.emit (events.js:315:20)\n\tat addChunk (_stream_readable.js:295:12)\n\tat readableAddChunk (_stream_readable.js:271:9)\n\tat Socket.Readable.push (_stream_readable.js:212:10)\n\tat Pipe.onStreamRead (internal/stream_base_commons.js:186:23)"}

Need to investigate and see how that command is being contributed (or, see if there was an activation error on the extension preventing it from being registered).