Permit using 'open-with' with folders in navigator context menu

Since the following Theia PR, the navigator's context menu "open-with"
command only appears when invoked on file nodes. Since we want to open
trace folders using this feature, we now re-register the command for
folders, as part of the trace viewer extension.

Theia PR: eclipse-theia/theia#13678

Signed-off-by: Marc Dumais <marc.dumais@ericsson.com>

theia-extensions/viewer-prototype/package.json

@@ -24,6 +24,7 @@
         "@theia/editor": "1.50.0",
         "@theia/filesystem": "1.50.0",
         "@theia/messages": "1.50.0",
+        "@theia/navigator": "1.50.0",
         "animate.css": "^4.1.1",
         "traceviewer-base": "0.2.3",
         "traceviewer-react-components": "0.2.3",

theia-extensions/viewer-prototype/src/browser/trace-explorer/trace-explorer-contribution.ts

@@ -4,6 +4,7 @@ import { TraceExplorerWidget } from './trace-explorer-widget';
 import { FrontendApplicationContribution, FrontendApplication } from '@theia/core/lib/browser';
 import { MenuModelRegistry, CommandRegistry } from '@theia/core';
 import { TraceExplorerCommands, TraceExplorerMenus } from './trace-explorer-commands';
+import { NavigatorContextMenu, FileNavigatorCommands } from '@theia/navigator/lib/browser/navigator-contribution';
 
 @injectable()
 export class TraceExplorerContribution
@@ -44,6 +45,15 @@ export class TraceExplorerContribution
             label: TraceExplorerCommands.REMOVE_TRACE.label,
             order: 'c'
         });
+
+        // since the following PR, navigator's "open-with" in Theia only works
+        // on files: https://github.com/eclipse-theia/theia/pull/13678
+        // Work-around: re-register the command only for folders:
+        menus.registerMenuAction(NavigatorContextMenu.NAVIGATION, {
+            commandId: FileNavigatorCommands.OPEN_WITH.id,
+            when: 'explorerResourceIsFolder',
+            label: 'Open With...'
+        });
     }
 
     async registerCommands(registry: CommandRegistry): Promise<void> {