[FIX] web_export_view: Several things:

* Retrieve all columns even if they are not sortable. Prevent to get select record column
* Prevent to process float time numbers as real numbers during the export

web_export_view/static/src/js/web_export_view.js

@@ -42,11 +42,13 @@ odoo.define('web_export_view', function (require) {
             var export_columns_keys = [];
             var export_columns_names = [];
             var column_index = 0;
+            var column_header_selector;
             $.each(view.renderer.columns, function () {
                 if (this.tag == 'field' && (this.attrs.widget === undefined || this.attrs.widget != 'handle')) {
                     // non-fields like `_group` or buttons
                     export_columns_keys.push(column_index);
-                    export_columns_names.push(view.$el.find('.o_list_view > thead > tr> th[title]:eq('+column_index+')')[0].textContent);
+                    column_header_selector = '.o_list_view > thead > tr> th:not([class*="o_list_record_selector"]):eq('+column_index+')';
+                    export_columns_names.push(view.$el.find(column_header_selector)[0].textContent);
                 }
                 column_index ++;
             });
@@ -69,7 +71,11 @@ odoo.define('web_export_view', function (require) {
                         }
                         else {
                             var text = $cell.text().trim();
-                            if ($cell.hasClass("o_list_number")) {
+                            var is_number = (
+                                $cell.hasClass('o_list_number') &&
+                                !$cell.hasClass('o_float_time_cell')
+                            );
+                            if (is_number) {
                                 export_row.push(parseFloat(
                                     text
                                     // Remove thousands separator
@@ -80,8 +86,7 @@ odoo.define('web_export_view', function (require) {
                                     // Remove non-numeric characters
                                     .replace(/[^\d\.-]/g, "")
                                 ));
-                            }
-                            else {
+                            } else {
                                 export_row.push(text);
                             }
                         }