From cb7b8b956f08b857e505759d53c43aa0e49b3abb Mon Sep 17 00:00:00 2001
From: Giannis Ntovas <ntovas.gi@gmail.com>
Date: Thu, 22 Mar 2018 23:52:49 +0200
Subject: [PATCH] Fix for duplicate extensions shown in "Save File" dialog.
 (#779)

---
 src/vs/editor/common/services/languagesRegistry.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/vs/editor/common/services/languagesRegistry.ts b/src/vs/editor/common/services/languagesRegistry.ts
index 6822a74a81..fe9fee9851 100644
--- a/src/vs/editor/common/services/languagesRegistry.ts
+++ b/src/vs/editor/common/services/languagesRegistry.ts
@@ -128,7 +128,9 @@ export class LanguagesRegistry {
 		if (Array.isArray(lang.extensions)) {
 			for (let extension of lang.extensions) {
 				mime.registerTextMime({ id: langId, mime: primaryMime, extension: extension }, this._warnOnOverwrite);
-				resolvedLanguage.extensions.push(extension);
+				if (!resolvedLanguage.extensions.includes(extension)){
+					resolvedLanguage.extensions.push(extension);
+				}
 			}
 		}