Test: Have a setting for maximum number open files (editors)

[bpasero]

Refs: #9872

• anyOS @Tyriar
• anyOS @chrmarti

Complexity: 3

This feature is not enabled by default and comes with 3 settings to enable:

• workbench.editor.limit.enabled
• workbench.editor.limit.perEditorGroup
• workbench.editor.limit.value

Steps:

• verify this setting makes sense when you read the description in settings editor
• verify that the setting works as advertised once enabled
  • when you open a new editor, editors that are NOT dirty will close by least recently use
    • across all editor groups globally (workbench.editor.limit.perEditorGroup: false)
    • within a group locally (workbench.editor.limit.perEditorGroup: true)
  • the limit when to start closing is configurable via workbench.editor.limit.value
• verify closing editors in LRU order works even after a restart
  • we preserve the recency of editor use in storage and restore it
• verify that enabling this setting will already close editors directly