This is a simple slightly-more-than-simple plugin for Obsidian that adds a marker to all the File Explorer items that are currently open in the workspace. This is useful if you generally work with more than one tab open at a time, and is different from the functionality that plugins designed to reveal the current tab in the file explorer perform.
• One marker is added for each instance of the open file.
• Clicking a marker will make the corresponding leaf active.
• The marker can be positioned before or after (default) the file name, or aligned to the left or right side of the file explorer via the Settings.
Note: This screenshot includes some behavior handled by my "Continuous Mode" plugin (q.v.).