[FIX] web_editor: two editor and image bar buttons

Some image functionalities of the inline summernote would only take the
first of multiple editor into account when selecting the targeted image
of an image button action (image size, image padding, ...).

This commit select the appropriate editor given the current editable.

closes odoo#11474
opw-668861

addons/web_editor/static/src/js/rte.summernote.js

@@ -295,11 +295,12 @@ eventHandler.modules.handle.update = function ($handle, oStyle, isAirMode) {
 //////////////////////////////////////////////////////////////////////////////////////////////////////////
 /* hack for image and link editor */
 
-function getImgTarget () {
-  return $(".note-control-selection").data('target');
+function getImgTarget ($editable) {
+    var $handle = $editable ? dom.makeLayoutInfo($editable).handle() : undefined;
+    return $(".note-control-selection", $handle).data('target');
 }
 eventHandler.modules.editor.padding = function ($editable, sValue) {
-    var $target = $(getImgTarget());
+    var $target = $(getImgTarget($editable));
     var paddings = "small medium large xl".split(/\s+/);
     $editable.data('NoteHistory').recordUndo();
     if (sValue.length) {
@@ -309,24 +310,24 @@ eventHandler.modules.editor.padding = function ($editable, sValue) {
     $target.removeClass("padding-" + paddings.join(" padding-"));
 };
 eventHandler.modules.editor.resize = function ($editable, sValue) {
-    var $target = $(getImgTarget());
+    var $target = $(getImgTarget($editable));
     $editable.data('NoteHistory').recordUndo();
     var width = ($target.attr('style') || '').match(/(^|;|\s)width:\s*([0-9]+)%/);
     if (width) {
         width = width[2]/100;
     }
-    $(getImgTarget()).css('width', width != sValue ? (sValue * 100) + '%' : '');
+    $target.css('width', width != sValue ? (sValue * 100) + '%' : '');
 };
 eventHandler.modules.editor.resizefa = function ($editable, sValue) {
-    var $target = $(getImgTarget());
+    var $target = $(getImgTarget($editable));
     $editable.data('NoteHistory').recordUndo();
     $target.attr('class', $target.attr('class').replace(/\s*fa-[0-9]+x/g, ''));
     if (+sValue > 1) {
         $target.addClass('fa-'+sValue+'x');
     }
 };
 eventHandler.modules.editor.floatMe = function ($editable, sValue) {
-    var $target = $(getImgTarget());
+    var $target = $(getImgTarget($editable));
     $editable.data('NoteHistory').recordUndo();
     switch (sValue) {
         case 'center': $target.toggleClass('center-block').removeClass('pull-right pull-left'); break;
@@ -335,7 +336,7 @@ eventHandler.modules.editor.floatMe = function ($editable, sValue) {
     }
 };
 eventHandler.modules.editor.imageShape = function ($editable, sValue) {
-    var $target = $(getImgTarget());
+    var $target = $(getImgTarget($editable));
     $editable.data('NoteHistory').recordUndo();
     $target.toggleClass(sValue);
 };