Test: Explorer Compact Folders

[joaomoreno]

Tests #41627, #84597

• Windows @rebornix
• Linux @aeschli
• macOS @jrieken

Complexity: 4

Authors: @joaomoreno, @isidorn

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The explorer now has a new setting explorer.compactFolders, enabled by default, which sets it to render single child folder sequences in a single tree row. A great use case for this are Java packages, which are usually laid out as single child folder sequences in disk. When rendering such compact folder nodes, we must make sure no functionality is dropped. Please do a feature test run over the following features wrt compact folder nodes, as well as an overall explorer smoketest:

• Mouse interaction: selecting, toggling expansion
• Keyboard interaction: navigating in compact folder row
• Context menus (Shift-F10 to trigger it using the keyboard)
• Play around with the files.exclude setting
• Drag from and drop into compact folders
• Keyboard filtering (type anything in the explorer, try both highlighting and filter mode)
• Accessibility (screen reader should always read folder name when focused on it)
• Toggle the explorer.compactFolders setting