fix(mermaid): lag during editing (closes #6443)

apps/client/src/services/spaced_update.ts

@@ -51,6 +51,14 @@ export default class SpacedUpdate {
         this.lastUpdated = Date.now();
     }
 
+    /**
+     * Sets the update interval for the spaced update.
+     * @param interval The update interval in milliseconds.
+     */
+    setUpdateInterval(interval: number) {
+        this.updateInterval = interval;
+    }
+
     triggerUpdate() {
         if (!this.changed) {
             return;

apps/client/src/widgets/type_widgets/abstract_split_type_widget.ts

@@ -130,7 +130,8 @@ export default abstract class AbstractSplitTypeWidget extends TypeWidget {
 
     constructor() {
         super();
-        this.editorTypeWidget = new EditableCodeTypeWidget();
+
+        this.editorTypeWidget = new EditableCodeTypeWidget(true);
         this.editorTypeWidget.updateBackgroundColor = () => {};
         this.editorTypeWidget.isEnabled = () => true;
 
@@ -146,6 +147,8 @@ export default abstract class AbstractSplitTypeWidget extends TypeWidget {
     doRender(): void {
         this.$widget = $(TPL);
 
+        this.spacedUpdate.setUpdateInterval(750);
+
         // Preview pane
         this.$previewCol = this.$widget.find(".note-detail-split-preview-col");
         this.$preview = this.$widget.find(".note-detail-split-preview");

apps/client/src/widgets/type_widgets/editable_code.ts

@@ -28,6 +28,16 @@ const TPL = /*html*/`
 
 export default class EditableCodeTypeWidget extends AbstractCodeTypeWidget {
 
+    private debounceUpdate: boolean;
+
+    /**
+     * @param debounceUpdate if true, the update will be debounced to prevent excessive updates. Especially useful if the editor is linked to a live preview.
+     */
+    constructor(debounceUpdate: boolean = false) {
+        super();
+        this.debounceUpdate = debounceUpdate;
+    }
+
     static getType() {
         return "editableCode";
     }
@@ -46,7 +56,13 @@ export default class EditableCodeTypeWidget extends AbstractCodeTypeWidget {
         return {
             placeholder: t("editable_code.placeholder"),
             vimKeybindings: options.is("vimKeymapEnabled"),
-            onContentChanged: () => this.spacedUpdate.scheduleUpdate(),
+            onContentChanged: () => {
+                if (this.debounceUpdate) {
+                    this.spacedUpdate.resetUpdateTimer();
+                }
+
+                this.spacedUpdate.scheduleUpdate();
+            },
             tabIndex: 300
         }
     }