Fix paths from Windows client to non-Windows server

Fixes #1659
Fixes #1642

ci/dev/vscode.patch

@@ -248,19 +248,17 @@ index 1e16cde724..0000000000
 -target "12.4.0"
 -runtime "node"
 diff --git a/src/vs/base/common/network.ts b/src/vs/base/common/network.ts
-index e4546b2cf6..9df12239fb 100644
+index e4546b2cf6..ad2c544e89 100644
 --- a/src/vs/base/common/network.ts
 +++ b/src/vs/base/common/network.ts
-@@ -94,16 +94,18 @@ class RemoteAuthoritiesImpl {
+@@ -94,16 +94,17 @@ class RemoteAuthoritiesImpl {
  		if (host && host.indexOf(':') !== -1) {
  			host = `[${host}]`;
  		}
 -		const port = this._ports[authority];
 +		// const port = this._ports[authority];
  		const connectionToken = this._connectionTokens[authority];
--		let query = `path=${encodeURIComponent(uri.path)}`;
-+		// NOTE@coder: Use fsPath for Windows support.
-+		let query = `path=${encodeURIComponent(uri.fsPath)}`;
+ 		let query = `path=${encodeURIComponent(uri.path)}`;
  		if (typeof connectionToken === 'string') {
  			query += `&tkn=${encodeURIComponent(connectionToken)}`;
  		}
@@ -1054,7 +1052,7 @@ index 0000000000..0d2e93edae
 +}
 diff --git a/src/vs/server/browser/worker.ts b/src/vs/server/browser/worker.ts
 new file mode 100644
-index 0000000000..8db1e17c38
+index 0000000000..a93381631a
 --- /dev/null
 +++ b/src/vs/server/browser/worker.ts
 @@ -0,0 +1,57 @@
@@ -1077,7 +1075,7 @@ index 0000000000..8db1e17c38
 +		scheme: self.location.protocol.replace(':', ''),
 +		authority: self.location.host,
 +		path: self.location.pathname.replace(/\/static\/([^\/]+)\/.*$/, '/static/$1\/'),
-+		query: `tar=${encodeURIComponent(module.extensionLocation.fsPath)}`,
++		query: `tar=${encodeURIComponent(module.extensionLocation.path)}`,
 +	});
 +	const response = await fetch(fetchUri.toString(true));
 +	if (response.status !== 200) {

src/node/app/vscode.ts

@@ -19,6 +19,53 @@ import { Args } from "../cli"
 import { HttpProvider, HttpProviderOptions, HttpResponse, Route } from "../http"
 import { settings } from "../settings"
 
+/**
+ * Taken from vs/base/common/charCode.ts. Copied for now instead of importing so
+ * we don't have to set up a `vs` alias to be able to import with types (since
+ * the alternative is to directly import from `out`).
+ */
+const enum CharCode {
+  Slash = 47,
+  A = 65,
+  Z = 90,
+  a = 97,
+  z = 122,
+  Colon = 58,
+}
+
+/**
+ * Compute `fsPath` for the given uri.
+ * Taken from vs/base/common/uri.ts. It's not imported to avoid also importing
+ * everything that file imports.
+ */
+function uriToFsPath(uri: { authority?: string; path: string; scheme: string }, keepDriveLetterCasing = false): string {
+  const isWindows = process.platform === "win32"
+  let value: string
+  if (uri.authority && uri.path.length > 1 && uri.scheme === "file") {
+    // unc path: file://shares/c$/far/boo
+    value = `//${uri.authority}${uri.path}`
+  } else if (
+    uri.path.charCodeAt(0) === CharCode.Slash &&
+    ((uri.path.charCodeAt(1) >= CharCode.A && uri.path.charCodeAt(1) <= CharCode.Z) ||
+      (uri.path.charCodeAt(1) >= CharCode.a && uri.path.charCodeAt(1) <= CharCode.z)) &&
+    uri.path.charCodeAt(2) === CharCode.Colon
+  ) {
+    if (!keepDriveLetterCasing) {
+      // windows drive letter: file:///c:/far/boo
+      value = uri.path[1].toLowerCase() + uri.path.substr(2)
+    } else {
+      value = uri.path.substr(1)
+    }
+  } else {
+    // other path
+    value = uri.path
+  }
+  if (isWindows) {
+    value = value.replace(/\//g, "\\")
+  }
+  return value
+}
+
 export class VscodeHttpProvider extends HttpProvider {
   private readonly serverRootPath: string
   private readonly vsRootPath: string
@@ -151,7 +198,7 @@ export class VscodeHttpProvider extends HttpProvider {
       case "/resource":
       case "/vscode-remote-resource":
         if (typeof route.query.path === "string") {
-          return this.getResource(route.query.path)
+          return this.getResource(uriToFsPath({ scheme: "file", path: route.query.path }))
         }
         break
       case "/webview":