Freeze when doing F5 or view change while many files are selected

Version: Thunar master (510d8280)

In order to reproduce, create some folder with 100.000 files:

for i in {1..100000}; do touch "$i"; done

• Open that folder in thunar
• Press CTRL+A to select all files
• Press F5
• Toggle between list-view and icon-view

Assumption for the freeze: The "selected-files" container is using GList as type, not GHashTable/GSequence and because of that, does not perform well for huge numbers of files.

Related: !445 (merged)