Feed correct line number to gvim on launch

Clicking Error overlay should feed the correct line number for gvim.

Added `gvim` in `COMMON_EDITORS_LINUX`, launches new gvim when it is running.

Tested with gvim 8.0.707 on a Debian 4.9.110-3+deb9u4 (2018-08-21) x86_64 GNU/Linux VM

Relates to facebook#2636.

packages/react-dev-utils/launchEditor.js

@@ -67,6 +67,7 @@ const COMMON_EDITORS_LINUX = {
   code: 'code',
   'code-insiders': 'code-insiders',
   emacs: 'emacs',
+  gvim: 'gvim',
   'idea.sh': 'idea',
   'phpstorm.sh': 'phpstorm',
   'pycharm.sh': 'pycharm',
@@ -136,6 +137,7 @@ function getArgumentsForLineNumber(
     case 'vim':
     case 'mvim':
     case 'joe':
+    case 'gvim':
       return ['+' + lineNumber, fileName];
     case 'emacs':
     case 'emacsclient':