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Weird auto-formatting of code upon paste

See original GitHub issue

Description

In JS files this extension will sometimes mess up indentation upon pasting. The circumstances under which this seems to happen is when having "editor.formatOnPaste": true enabled (something that Atom Keymap adds to your config automatically).

With prettier extension disabled:

vscode_prettier_ok This is when having prettier disabled. I start out by marking the text and pressing CMD+C, place the cursor where I want to paste, and CMD+V. Everything pastes as one would expect.

With prettier extension enabled and including trailing comma

vscode_prettier_fail This is after enabling prettier. Again, I mark the text, copy it, paste it. Split second after pasting prettier has formatted everything in a horrific manner.

With prettier extension enabled an excluding trailing comma

I then found out that if I do not mark the last comma in the selection I want to copy+paste, it works even with prettier enabled.

vscode_prettier_enabled_ok

Snippet:

module.exports = ({ config }) => {
  return [
    {
      key: 'some value',
      fn: async (req, res) => {
        return 'some value'
      },
    },
  ]
}

My config:

{
  "workbench.colorTheme": "Oceanic Next Italic",
  "window.nativeTabs": true,
  "editor": {
    "formatOnSave": true,
    "fontFamily": "Fira Code",
    "fontSize": "16",
    "fontLigatures": true,
    "tabSize": 2,
    "tabCompletion": true,
  },
  "prettier": {
    "singleQuote": true,
    "semi": false,
    "trailingComma": "es5",
    "printWidth": 100
  },
  // added by atom keymap
  "atomKeymap.promptV3Features": true,
  "editor.multiCursorModifier": "ctrlCmd",
  "editor.formatOnPaste": true
  // end atom keymap
}