Add files.watcherExlude to vscode.md

docs/vscode.md

 # Visual Studio Code Dev
 
 Visual Studio Code is a free, lightweight and powerful code editor for Windows,
 Mac and Linux, based on Electron/Chromium. It has built-in support for
 JavaScript, TypeScript and Node.js and a rich extension ecosystem that adds
 intellisense, debugging, syntax highlighting etc. for many languages (C++,
 Python, Go). It works without too much setup. Get started
 [here](https://code.visualstudio.com/docs).
 
 It is NOT a full-fledged IDE like Visual Studio. The two are completely
@@ skipping 173 matching lines @@
     // approximate syntax highlighting. Ignore the linter warnings!
     "*.gni" : "javascript",
     "*.gn" : "javascript"
   },
 
   "files.exclude": {
     // Ignore build output folders.
     "out*/**": true
   },
 
+  "files.watcherExclude": {

[ljusten (tachyonic), 2017/04/27 14:16:24]

Out of curiosity, did that cause any issues? Did you notice any improvement?

[dullweber, 2017/04/27 14:27:29]

I had the problem that when I run git cl format, vscode didn't notice any
changes to the currently open file. Adding watcherExclude fixed this.

[ljusten (tachyonic), 2017/04/27 15:54:42]

Acknowledged.

+    // Don't check out/ and third_party/ for changes to fix issue
+    // where vscode doesn't notice that files have changed.
+    // https://github.com/Microsoft/vscode/issues/3998
+    "**/out/**": true,

[ljusten (tachyonic), 2017/04/27 14:16:24]

Suggest to use **/out*/** since IIRC some Chrome OS workflows generate
out-$board directories.

Is excluding out really necessary given that it's already excluded by
files.exclude?

[dullweber, 2017/04/27 14:27:29]

files.exlude is not applied to the watcher for some reason. Maybe the issue only
hit me because I have quite a few different directories in out/ with different
configurations. 
I guess it is mostly important to reduce the number of files that are being
watched. Unless these chromeos folders also contains hundrets of thousands of
files it probably doesn't matter.

[ljusten (tachyonic), 2017/04/27 15:54:42]

The chromeos folders are regular build folders, so yes, they're big.

+    "**/third_party/**": true

[ljusten (tachyonic), 2017/04/27 14:16:24]

The initial **/ seems unnecessary (files.excludes works without that), but
according to jsturgis' comment on the github issue it appears to be required.
Maybe add a comment?

[dullweber, 2017/04/27 14:27:29]

It is currently required to have the initial **/, I guess that is a bug but it
doesn't work without this. I subscribed to the github issue and will remove the
**/ when it is fixed.

[ljusten (tachyonic), 2017/04/27 15:54:42]

Acknowledged.

+  },
+
   // Wider author column for annotator extension.
   "annotator.annotationColumnWidth": "24em",
 
   // C++ clang format settings.
   "C_Cpp.clang_format_path": "<full_path_to_your_home>/depot_tools/clang-format",
   "C_Cpp.clang_format_sortIncludes": true,
   "C_Cpp.clang_format_formatOnSave": true,
 
   // YouCompleteMe
   "ycmd.path": "<full_path_to_your_home>/.vim/bundle/YouCompleteMe/third_party/ycmd",
@@ skipping 270 matching lines @@
 
 ```
 "git.autorefresh": false,
 "C_Cpp.autocomplete": "Disabled",
 "C_Cpp.addWorkspaceRootToIncludePath": false
 ```
 
 ### More
 More tips and tricks can be found
 [here](https://github.com/Microsoft/vscode-tips-and-tricks/blob/master/README.md).