earshinov / vscode-filter-lines

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test: Count the number of open documents using `vscode.window.tabGroups` instead of `vscode.workspace.textDocuments.length`.

Turned out that in the up-to-date VS Code, `vscode.workspace.textDocuments` can still contain documents just closed with
`executeCommand('workbench.action.closeAllEditors')` and these documents even have `isClosed: false`.
Using `executeCommand('openEditors.closeAll')` doesn't make it any better.

In order to be able to access `vscode.window.tabGroups`, bumped min required VS Code version to 1.67.0.
The extension would still work fine with older versions, but having different VS Code versions in `package.json` in

```
"engines": {
  "vscode": "..."
},
```

and

```
"devDependencies": {
  "@types/vscode": "..."
}
```

would mean possibly shooting ourselves in the foot in the future.

79 of 93 branches covered (84.95%)

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149 of 151 relevant lines covered (98.68%)

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