🐛 exclude extensions from git menu actions

fixes #22373

extensions/git/package.json

@@ -510,12 +510,12 @@
         {
           "command": "git.openFile",
           "group": "navigation",
-          "when": "isInDiffEditor && resourceScheme == file"
+          "when": "isInDiffEditor && resourceScheme != extension"
         },
         {
           "command": "git.openChange",
           "group": "navigation",
-          "when": "!isInDiffEditor && resourceScheme == file"
+          "when": "!isInDiffEditor && resourceScheme != extension"
         }
       ]
     },

src/vs/workbench/parts/extensions/common/extensionsInput.ts

@@ -9,6 +9,7 @@ import { localize } from 'vs/nls';
 import { TPromise } from 'vs/base/common/winjs.base';
 import { EditorInput } from 'vs/workbench/common/editor';
 import { IExtension } from 'vs/workbench/parts/extensions/common/extensions';
+import URI from 'vs/base/common/uri';
 
 export class ExtensionsInput extends EditorInput {
 
@@ -45,4 +46,11 @@ export class ExtensionsInput extends EditorInput {
 	supportsSplitEditor(): boolean {
 		return false;
 	}
+
+	getResource(): URI {
+		return URI.from({
+			scheme: 'extension',
+			path: this.extension.id
+		});
+	}
 }
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