Description Maxime Porhel 2023-06-20 04:45:41 EDT

+++ This bug was initially created as a clone of Bug #582089 +++

Steps to reproduce: 
* With 
  * Sirius 7.0.x or 7.1.x
  * With BPMN Designer (https://github.com/ObeoNetwork/BPMN-Designer)
  * Import the Travel Agency sample
* Case #1
  * Create a Collaboration diagram
  * Select the tool "Participant et un processus existant"
  * Single click on the diagram 
  * Select "Travel Agency" in the wizard.
  * Layout "KO" :
    * Region content is centered, 
    * RegionContainer notation node is in auto-size but but figure has the default dimension
    * Layout is not stable (Figure are well auto-sized) after a close/reopen diagram (or addition of a new child in the Region)
* Case #2
  * From previous diagram
  * Select the particpant, unset its process from the properties views
  * Check that the participant is in auto-size and emtpy on the diagram
  * Layout "KO" :
    * RegionContainer notation node is in auto-size but but figure has the default dimension
    * Layout is not stable (Figure are well auto-sized) after a close/reopen diagram (or addition of a new child in the Region)
* Case #3
  * Create a new Collaboration diagram
  * Layout OK: Participant is created with Region content layouted, RegionContainer layout is stable and correctly auto-sized.
* Case #4
  * From any previous case, 
  * Move nodes inside the region to right or bottom
  * Scroll bars appears
  * Close and reopen the diagram : no more scrollbars and figure are correctly resized.
  * Layout KO: in auto-size, the RegionContainer should adapt its size to the Region contents.