Fix equality check of text documents to resolve inactive region highlights not being displayed (clangd#515)

Also add tests for InactiveRegionsFeature, including a test for the bug being fixed here

Author: kon72

.vscode/launch.json

@@ -1,28 +1,26 @@
 // A launch configuration that compiles extension and opens it inside a new window.
 {
-    "version": "0.1.0",
+    "version": "0.2.0",
     "configurations": [
         {
             "name": "Launch Extension",
             "type": "extensionHost",
             "request": "launch",
             "runtimeExecutable": "${execPath}",
             "args": ["--extensionDevelopmentPath=${workspaceRoot}" ],
-            "stopOnEntry": false,
             "sourceMaps": true,
-            "outFiles": [ "${workspaceRoot}/out/src/**/*.js" ],
-            "preLaunchTask": "npm"
+            "outFiles": [ "${workspaceRoot}/out/**/*.js" ],
+            "preLaunchTask": "npm: compile"
         },
         {
             "name": "Launch Tests",
             "type": "extensionHost",
             "request": "launch",
             "runtimeExecutable": "${execPath}",
-            "args": ["--extensionDevelopmentPath=${workspaceRoot}", "--extensionTestsPath=${workspaceRoot}/out/test" ],
-            "stopOnEntry": false,
+            "args": ["--extensionDevelopmentPath=${workspaceRoot}", "--disable-extensions", "--extensionTestsPath=${workspaceRoot}/out/test" ],
             "sourceMaps": true,
-            "outFiles": [ "${workspaceRoot}/out/test/**/*.js" ],
-            "preLaunchTask": "npm"
+            "outFiles": [ "${workspaceRoot}/out/**/*.js" ],
+            "preLaunchTask": "npm: test-compile"
         }
     ]
 }