[FIX] web_editor,knowledge: suspend wysiwyg onBlur with dialogs

Sometimes, there is a crash when uploading a file when loading an article for
the first time.

Impacted versions:
16.0+

How to reproduce:
- open the odoo home page (module menu) and CTRL+f5 (force reload)
- go to the knowledge app
- in an article, put the cursor somewhere and type ENTER to create a new line
- type the /file command in that line
- try to upload a file
- traceback (if it does not happen, try again from the first step, it is not
  always consistent)

Fix:
Delay the _onBlur handling of the wysiwig when using the modal. The Blur event
may occur and may trigger an update on the html_field, which may in turn induce
a rerendering of the component and its value.
We don't want this to occur when using the modal, because the selection was
registered by the modal to restore it when the modal closes (`preserveCursor`).

If the contents of the html_field are updated, then the stored position used to
restore the selection won't be in the DOM anymore, and the restoration will
fail. As such when we try to insert the Knowledge file block, the selection is
not in the editor and the method fails.

Task-2889670
Task-3128388
Task-3086694

X-original-commit: 2591d343793f59e2e70e7ffe8fa666661995348f
Part-of: odoo/odoo#110089
Co-authored-by: Antoine Guenet <age@odoo.com>

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -1356,6 +1356,11 @@ const Wysiwyg = Widget.extend({
         const field = $editable.data('oe-field');
         const type = $editable.data('oe-type');
 
+        // The html_field value should not be updated while the mediaDialog is
+        // in use because if its value change, restoreSelection may fail since
+        // it has a reference to HTMLElements which are not in the DOM anymore.
+        this._shouldDelayBlur = true;
+
         this.mediaDialogWrapper = new ComponentWrapper(this, MediaDialogWrapper, {
             resModel: model,
             resId: $editable.data('oe-id'),
@@ -2445,8 +2450,9 @@ const Wysiwyg = Widget.extend({
         if (!e.target.classList.contains('o_editable_date_field_linked')) {
             this.$editable.find('.o_editable_date_field_linked').removeClass('o_editable_date_field_linked');
         }
-        if (e.target.closest('.oe-toolbar')) {
-            this._onToolbar = true;
+        const closestDialog = e.target.closest('.o_dialog, .o_web_editor_dialog');
+        if (e.target.closest('.oe-toolbar') || (closestDialog && closestDialog.querySelector('.o_select_media_dialog, .o_link_dialog'))) {
+            this._shouldDelayBlur = true;
         } else {
             if (this._pendingBlur && !e.target.closest('.o_wysiwyg_wrapper')) {
                 // todo: to remove when removing the legacy field_html
@@ -2454,11 +2460,11 @@ const Wysiwyg = Widget.extend({
                 this.options.onWysiwygBlur && this.options.onWysiwygBlur();
                 this._pendingBlur = false;
             }
-            this._onToolbar = false;
+            this._shouldDelayBlur = false;
         }
     },
     _onBlur: function () {
-        if (this._onToolbar) {
+        if (this._shouldDelayBlur) {
             this._pendingBlur = true;
         } else {
             // todo: to remove when removing the legacy field_html