Fix find_widget bugs

src/public/app/widgets/find.js

@@ -158,9 +158,11 @@ export default class FindWidget extends NoteContextAwareWidget {
         }
 
         this.handler = await this.getHandler();
+        
+        const isReadOnly = await this.noteContext.isReadOnly();
 
         let selectedText = '';
-        if (this.note.type === 'code'){
+        if (this.note.type === 'code' && !isReadOnly){
             const codeEditor = await this.noteContext.getCodeEditor();
             selectedText = codeEditor.getSelection();
         }else{
@@ -168,7 +170,6 @@ export default class FindWidget extends NoteContextAwareWidget {
         }
         this.$widget.show();
         this.$input.focus();
-        const isReadOnly = await this.noteContext.isReadOnly();
         if (['text', 'code'].includes(this.note.type) && !isReadOnly) {
             this.$replaceWidgetBox.show();
         }else{

src/public/app/widgets/find_in_code.js

@@ -171,6 +171,10 @@ export default class FindInCode {
         codeEditor.focus();
     }
     async replace(replaceText) {
+        // this.findResult may be undefined and null
+        if (!this.findResult || this.findResult.length===0){
+            return;
+        }
         let currentFound = -1;
         this.findResult.forEach((marker, index) => {
             const pos = marker.find();
@@ -202,6 +206,9 @@ export default class FindInCode {
         }
     }
     async replaceAll(replaceText) {
+        if (!this.findResult || this.findResult.length===0){
+            return;
+        }
         const codeEditor = await this.getCodeEditor();
         const doc = codeEditor.doc;
         codeEditor.operation(() => {

src/public/app/widgets/type_widgets/read_only_code.js

@@ -51,7 +51,7 @@ export default class ReadOnlyCodeTypeWidget extends AbstractCodeTypeWidget {
 
         await this.initialized;
 
-        resolve(this.$content);
+        resolve(this.$editor);
     }
 
     format(html) {