Fix cannot show results after changed active TextEditor.

Author: plylrnsdy

src/Decorator.ts

@@ -23,6 +23,7 @@ const colorMap = {
     'Console': '#457abb',
     'Error': 'red',
 }
+// TODO: if Node's Version of VSCode >=9.9, use option `compact`
 const inspectOptions = { maxArrayLength: null, depth: null };
 
 type Data = { line: number, type: 'Expression' | 'Terminal', value: any };

src/ReplClient.ts

@@ -38,8 +38,10 @@ export default class ReplClient {
         this.decorator = new Decorator(outputChannel);
 
         this.changeActiveDisposable = window.onDidChangeActiveTextEditor(async (editor) => {
-            if (this.editor === editor)
+            if (this.editor && this.editor.document === editor.document) {
+                this.init(editor, editor.document);
                 this.interpret();
+            }
         });
 
         this.closeTextDocumentDisposable = workspace.onDidCloseTextDocument(async (document) => {
@@ -122,8 +124,6 @@ export default class ReplClient {
         if (this.outputChannel)
             this.outputChannel.appendLine(`Disposing REPL server.`);
 
-        this.editor = null;
-
         this.repl.send({ operation: 'exit' });
         this.repl = null;
     }