fix this keyword in IDE watch <wanggang203@huawei.com>

Signed-off-by: Gavin1012 <wanggang203@huawei.com>
Change-Id: I77344ff85852ffa5781b1c1c96a8c83476b6b6b5

ts2panda/src/compiler.ts

@@ -1020,7 +1020,8 @@ export class Compiler {
                     scope.setLexVar(v, this.scope);
                 }
             }
-            pandaGen.loadAccFromLexEnv(node, scope!, level, v);
+            CmdOptions.isWatchMode() ? pandaGen.loadByNameViaDebugger(node, "this", CacheList.True)
+                                     : pandaGen.loadAccFromLexEnv(node, scope!, level, v);
         } else {
             throw new Error("\"this\" must be a local variable");
         }

ts2panda/tests/watch_expression/addWatch.test.ts

@@ -278,17 +278,22 @@ describe("WatchExpressions", function () {
     });
 
     it("watch ThisKeyword", function () {
-        let snippetCompiler = new SnippetCompiler();
-        snippetCompiler.compile("this");
-        let globalScope = snippetCompiler.getGlobalScope();
-        let insns = snippetCompiler.getGlobalInsns();
+        CmdOptions.parseUserCmd([""]);
+        CmdOptions.setWatchArgs(['','']);
+        let insns = compileMainSnippet(`
+        this
+        `);
         let expected = [
-            new LdaDyn(new VReg()),
+            new EcmaLdobjbyname('debuggerGetValue', new VReg()),
+            new StaDyn(new VReg()),
+            new LdaStr('this'),
+            new StaDyn(new VReg()),
+            new MovDyn(new VReg(), new VReg()),
+            new EcmaCallargs2dyn(new VReg(), new VReg(), new VReg()),
+
             new ReturnDyn()
         ];
         expect(checkInstructions(insns, expected)).to.be.true;
-        let thisVar = globalScope!.findLocal("this");
-        expect(thisVar instanceof LocalVariable).to.be.true;
     });
 
     it("watch MetaProperty", function () {