Preparations

1. open 2 windows in Firefox: normal and private browsing one
2. in both windows:
   • login to Admin Console (will be 2 different sessions)
   • go to User Management → Users section
3. enable debug all pages setting in debugger toolbar in normal browser window
4. in IDE (PhpStorm):
   • open settings page
   • change Max. simultaneous connections setting to 2 in the Languages & Frameworks → PHP → Debug setting group
   • save changes
   • open /core/kernel/utility/temp_handler.php file
   • place breakpoint at $ids = $this->DoCopyTempToOriginal($this->Tables, null, $master_ids); line in the kTempTablesHandler::SaveEdit method
5. in private browsing window:
   • create user with user_p1 username
   • create user with user_p2 username

Part 1 (adding + editing doesn't collide)

1. in normal window:
   • create user with user_ae1 username
   • confirm, that PhpStorm's debugger kicked in and code is paused at above created breakpoint
2. in private browsing window
   • double click on user_p1 user record to begin editing process
   • change some fields (but not username)
   • press save
   • confirm, that made changes were saved in live table
   • confirm, that saving process took no longer then 5 seconds
3. in normal window:
   • continue script execution
   • confirm, that user_ae1 user was created

Part 2 (adding + adding doesn't collide)

1. in normal window:
   • create user with user_aa1 username
   • confirm, that PhpStorm's debugger kicked in and code is paused at above created breakpoint
2. in private browsing window
   • create user with user_aa2 username
   • confirm, that creation process took no longer then 5 seconds
   • confirm, that user_aa2 user was created
3. in normal window:
   • continue script execution
   • confirm, that user_aa1 user was created

Part 3 (same record editing does collide)

1. in normal window:
   • double click on user_p1 user record to begin editing process
   • confirm, that PhpStorm's debugger kicked in and code is paused at above created breakpoint
2. in private browsing window
   • select both user_p1 and user_p2 in users grid
   • click on Edit button on toolbar
   • change some fields (but not username)
   • press save
   • confirm, that after 30 seconds delay an alert was shown with an error message
   • confirm, that after pressing OK button (name might be OS-specific) in that alert the changes made to user record are still shown in editing window
3. in normal window:
   • continue script execution
4. in private browsing window
   • press Save button on toolbar
   • confirm, that creation process took no longer then 5 seconds
   • confirm, that changes made to user_p2 and user_p2 are shown in grid

Part 4 (different record editing doesn't collide)

1. in normal window:
   • double click on user_p1 user record to begin editing process
   • confirm, that PhpStorm's debugger kicked in and code is paused at above created breakpoint
2. in private browsing window
   • double click on user_p2 user record to begin editing process
     • change some fields (but not username)
   • press save
   • confirm, that creation process took no longer then 5 seconds
   • confirm, that changes made are shown in grid
3. in normal window:
   • continue script execution

Part 5 (different unit record editing doesn't collide)

1. in normal window:
   • double click on user_p1 user record to begin editing process
   • confirm, that PhpStorm's debugger kicked in and code is paused at above created breakpoint
2. in private browsing window
   • go to Website & Content → Labels & Phrases section
   • locate phrase, which ID matches ID of user_p1 user and open it for editing
   • change it's translation
   • press save
   • confirm, that saving process took no longer then 5 seconds
   • confirm, that changes made are shown in grid
3. in normal window:
   • continue script execution