MDL-40600 core_courseformat: duplicate a named section with copy

When a named section is duplicated, the name must have a (copy) particle
to make visible what section is the original and what is the copy.

course/format/classes/base.php

@@ -1752,7 +1752,11 @@ public function duplicate_section(section_info $originalsection): section_info {
         $oldsectioninfo = get_fast_modinfo($course)->get_section_info($originalsection->section);
         $newsection = course_create_section($course, $oldsectioninfo->section + 1); // Place new section after existing one.
 
-        $newsection->name = $originalsection->name;
+        if (!empty($originalsection->name)) {
+            $newsection->name = get_string('duplicatedsection', 'moodle', $originalsection->name);
+        } else {
+            $newsection->name = $originalsection->name;
+        }
         $newsection->summary = $originalsection->summary;
         $newsection->summaryformat = $originalsection->summaryformat;
         $newsection->visible = $originalsection->visible;

course/format/tests/behat/duplicate_section.feature

@@ -22,5 +22,13 @@ Feature: Duplicate a section
   @javascript
   Scenario: Duplicate section
     Given I open section "1" edit menu
-    And I click on "Duplicate" "link" in the "Topic 1" "section"
+    When I click on "Duplicate" "link" in the "Topic 1" "section"
     Then I should see "Activity sample 2" in the "Topic 2" "section"
+
+  @javascript
+  Scenario: Duplicate a named section
+    Given I set the field "Edit topic name" in the "Topic 1" "section" to "New name"
+    And I should see "New name" in the "New name" "section"
+    When I open section "1" edit menu
+    And I click on "Duplicate" "link" in the "New name" "section"
+    Then I should see "Activity sample 2" in the "New name (copy)" "section"

course/upgrade.txt

@@ -4,6 +4,9 @@ information provided here is intended especially for developers.
 === 4.2 ===
 * course/mod.php now accepts parameter beforemod for adding course modules. It contains the course module id
   of an existing course module. The new module is inserted before this module.
+* The function duplicate_module() now has two new optional parameters:
+  - $sectionid to specify section the duplicated course module is placed in
+  - $changename to disable changing the name of the course module using the 'duplicatedmodule' lang string
 
 === 4.1 ===
 * The function course_modchooser() has been finally deprecated and can not be used anymore. Please use

lang/en/moodle.php

@@ -583,6 +583,7 @@
 $string['droptoupload'] = 'Drop files here to upload';
 $string['duplicate'] = 'Duplicate';
 $string['duplicatedmodule'] = '{$a} (copy)';
+$string['duplicatedsection'] = '{$a} (copy)';
 $string['edhelpaspellpath'] = 'To use spell-checking within the editor, you MUST have <strong>aspell 0.50</strong> or later installed on your server, and you must specify the correct path to access the aspell binary.  On Unix/Linux systems, this path is usually <strong>/usr/bin/aspell</strong>, but it might be something else.';
 $string['edhelpbgcolor'] = 'Define the edit area\'s background color.<br />Valid values are, for example: #FFFFFF or white';
 $string['edhelpcleanword'] = 'This setting enables or disables Word-specific format filtering.';