[FIX] web: debug mode tooltip

Display properly the content of context object instead of
[object Object].

addons/web/static/src/js/views/form/form_renderer.js

@@ -812,7 +812,7 @@ var FormRenderer = BasicRenderer.extend({
         _.each(this.allFieldWidgets[this.state.id], function (widget) {
             var idForLabel = self.idsForLabels[widget.name];
             var $label = idForLabel ? self.$('label[for=' + idForLabel + ']') : $();
-            if (core.debug || widget.attrs.help || widget.field.help) {
+            if (config.debug || widget.attrs.help || widget.field.help) {
                 self._addFieldTooltip(widget, $label);
             }
             if (widget.attrs.widget === 'upgrade_boolean') {

addons/web/static/src/xml/base_common.xml

@@ -59,11 +59,11 @@
         </li>
         <li t-if="widget.attrs.context || widget.field.context" data-item="context">
             <span class="oe_tooltip_technical_title">Context:</span>
-            <t t-esc="widget.attrs.context || widget.field.context"/>
+            <t t-esc="widget.attrs.context || JSON.stringify(widget.field.context)"/>
         </li>
         <li t-if="widget.attrs.domain || widget.field.domain" data-item="domain">
             <span class="oe_tooltip_technical_title">Domain:</span>
-            <t t-esc="widget.attrs.domain || widget.field.domain"/>
+            <t t-esc="widget.attrs.domain || JSON.stringify(widget.field.domain)"/>
         </li>
         <li t-if="widget.attrs.modifiers and widget.attrs.modifiers != '{}'" data-item="modifiers">
             <span class="oe_tooltip_technical_title">Modifiers:</span>

addons/web/static/tests/views/form_tests.js

@@ -5920,5 +5920,36 @@ QUnit.module('Views', {
 
         form.destroy();
     });
+
+    QUnit.test('proper context stringification in debug mode tooltip', function (assert) {
+        assert.expect(2);
+
+        var initialDebugMode = config.debug;
+        config.debug = true;
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form string="Partners">' +
+                    '<sheet>' +
+                        '<field name="product_id" context="{\'lang\': \'en_US\'}"/>' +
+                    '</sheet>' +
+                '</form>',
+        });
+
+        var $field = form.$('[name="product_id"]');
+        $field.tooltip('show', true);
+        $field.trigger($.Event('mouseenter'));
+        assert.strictEqual($('.oe_tooltip_technical>li[data-item="context"]').length,
+            1, 'context should be present for this field');
+        assert.strictEqual($('.oe_tooltip_technical>li[data-item="context"]')[0].lastChild.wholeText.trim(),
+            "{'lang': 'en_US'}", "context should be properly stringified");
+
+        config.debug = initialDebugMode;
+        form.destroy();
+    });
+
+
 });
 });