A userscript that adds filters that toggle the view of repo files by extension

• A group of buttons are added above the repository files, each one is set to filter a file name extension.
• In v1.1.0, extension subcategories are now separate, e.g. "user.js" and "js" target different files.
• The filters are only visible when there is more than one type of file extension present in the folder.
• Files with no extension will be labeled as "«no-ext»".
• Click on one or more filters to toggle the view of the files.
• Hovering over the filter will show the number of files found for that extension.
• Filter selections will be saved between sessions.
• Special Filters:
  • The "«all»" filter button toggles the view of all files.
  • The "«no-ext»" filter button toggles all files that do not have an extension. It is only added if such files exist.
  • The "«dot-files»" filter button toggles all dot-files (e.g. .gitignore, .gitattributes, etc). It is only added if such files exist.
  • The "«min»" filter button toggles all files with a .min. in the name. It is only added if such files exist.
• Made to work along with the GitHub image preview userscript; requires image-preview version 1.1.10+ for the best experience.
• Inspired by hide-files-on-github extension & a bunch of code copied from the github-diff-files-filter userscript.
• To do:
  • Add toggle for submodule and dot-folders.

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