Save FileBrowser root folders if it is visible.
When loading a session file (from menu or via the command line),
launch a FileBrowser from scratch and add folders from the file to it.
When loading an auto-saved session, ignore saved FileBrowser folders.
Store roots and selected item of FileBrowser in a Session class.
Add "FileBrowser" node to session XML.
It containts "latestSelectedItem" attribute and "root" child nodes.
This structure corresponds to the one from "config.xml".
Current save session behavior for Folder as Workspace (FaW) is like this:
1. FaW isn't opened, checkbox is greyed-out -> FaW info is not saved in session
2. FaW is opened, checkbox isn't checked -> FaW info isn't saved in session
3. FaW is opened, checkbox is checked -> FaW info is saved in session
Load session behavior:
1. FaW isn't open, session without FaW info -> FaW isn't shown after loading
2. FaW isn't open, session with FaW info -> FaW is shown after loading
3. FaW is open, session without FaW info -> FaW is kept as is without changes
4. FaW is open, session with FaW info -> FaW is shown with new directories from session
Fix#9165, close#9286
b9f498f041