diff --git a/runbot/static/src/js/fields/field_error_content.js b/runbot/static/src/js/fields/field_error_content.js
new file mode 100644
index 00000000..f653a5ad
--- /dev/null
+++ b/runbot/static/src/js/fields/field_error_content.js
@@ -0,0 +1,84 @@
+import { Component, useEffect, useState } from '@odoo/owl';
+
+import { registry } from '@web/core/registry';
+import { useBus } from '@web/core/utils/hooks';
+import { standardFieldProps } from "@web/views/fields/standard_field_props";
+import { TextField } from '@web/views/fields/text/text_field';
+import { X2ManyField, x2ManyField } from "@web/views/fields/x2many/x2many_field";
+import { CheckBox } from "@web/core/checkbox/checkbox";
+
+import { diff_match_patch } from "@runbot/libs/diff_match_patch/diff_match_patch";
+import { DiffDisplay } from './diff_display';
+
+
+export class ErrorContentOne2ManyList extends X2ManyField {
+    static template = 'runbot.ErrorContentOne2ManyList';
+    static components = {...X2ManyField.components, CheckBox};
+
+    setup() {
+        super.setup(...arguments);
+        this.creates = [];
+        this.state = useState({
+            useDiff: localStorage.getItem('runbot.error_content_diff_mode') === 'true',
+        });
+
+        useEffect(() => {
+            localStorage.setItem('runbot.error_content_diff_mode', this.state.useDiff);
+            this.env.bus.trigger(
+                'RUNBOT.TOGGLE-DIFF-MODE', {
+                    mode: this.state.useDiff,
+                },
+            );
+        }, () => [this.state.useDiff]);
+    }
+
+    get displayControlPanelButtons() {
+        return true;
+    }
+
+    onToggle(state) {
+        this.state.useDiff = state;
+    }
+}
+
+export const errorContentOne2ManyList = {
+    ...x2ManyField,
+    component: ErrorContentOne2ManyList,
+};
+
+export class FieldErrorContentContent extends Component {
+    static template = 'runbot.FieldErrorContentContent';
+    static components = { TextField, DiffDisplay };
+    static props = {...standardFieldProps};
+
+    setup() {
+        // We assume that the content is readonly here
+        this.otherRecords = this.props.record.model.root.data.error_content_ids.records;
+        this.state = useState({
+            useDiff: localStorage.getItem('runbot.error_content_diff_mode') === 'true',
+        });
+
+        useBus(
+            this.env.bus, 'RUNBOT.TOGGLE-DIFF-MODE',
+            ({detail: {mode}}) => this.state.useDiff = mode,
+        );
+    }
+
+    get isParent() {
+        return this.otherRecords[0] === this.props.record;
+    }
+
+    get parent() {
+        return this.otherRecords[0];
+    }
+}
+
+export const fieldErrorContentContent = {
+    component: FieldErrorContentContent,
+    displayName: "Error Content diffable (list)",
+    supportedTypes: ["html", "text", "char"],
+};
+
+
+registry.category('fields').add('error_content_list', errorContentOne2ManyList);
+registry.category('fields').add('list.error_content_content', fieldErrorContentContent);
diff --git a/runbot/static/src/js/fields/field_error_content.xml b/runbot/static/src/js/fields/field_error_content.xml
new file mode 100644
index 00000000..0a931839
--- /dev/null
+++ b/runbot/static/src/js/fields/field_error_content.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates>
+    <t t-name="runbot.ErrorContentOne2ManyList" t-inherit="web.X2ManyField" t-inherit-mode="primary">
+        <div class="o_x2m_control_panel d-empty-none mt-1 mb-4" position="attributes">
+            <attribute name="class">o_x2m_control_panel d-empty-none mt-1</attribute>
+        </div>
+        <div role="toolbar" position="inside">
+            <CheckBox
+                className="'o_boolean_toggle form-switch'"
+                value="state.useDiff"
+                onChange.bind="onToggle"
+            >
+                Toggle diff mode
+            </CheckBox>
+        </div>
+    </t>
+
+    <t t-name="runbot.FieldErrorContentContent">
+        <t t-if="isParent || !this.state.useDiff">
+            <TextField t-props="this.props"/>
+        </t>
+        <DiffDisplay t-else=""
+            fromValue="parent.data.content" toValue="props.record.data.content"
+            lineFilter="(line) => line.type === 'added'"
+        />
+    </t>
+</templates>
diff --git a/runbot/views/build_error_views.xml b/runbot/views/build_error_views.xml
index b1c30c92..4da1b84f 100644
--- a/runbot/views/build_error_views.xml
+++ b/runbot/views/build_error_views.xml
@@ -15,9 +15,9 @@
               <button name="action_view_errors" string="See all linked errors" type="object" class="oe_highlight"/>
               <group string="Base info">
                 <field name="name"/>
-                <field name="error_content_ids" readonly="1">
+                <field name="error_content_ids" readonly="1" widget="error_content_list">
                     <list limit="5">
-                      <field name="content" readonly="1"/>
+                      <field name="content" readonly="1" widget="error_content_content"/>
                       <!--field name="module_name" readonly="1"/-->
                       <!--field name="function" readonly="1"/-->
                       <!--field name="file_path" readonly="1"/-->