Test: icons theming

[aeschli]

Refs: #92791

• anyOS @digitarald debug icons
• anyOS @devinvalenciano extensions icons
• anyOS @RMacfarlane notebook icons

Complexity: 3

Create Issue

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• clone the vscode-extension-samples and open the product-icon-theme-sample in VSCode

• Look at theme/v1-product-icon-theme.json: the sample product icon theme redefines some of the view icons

• press F5. The Extension Development Host window that opens should automatically have the new product icon theme enabled and show different view icons

• make changes to the theme file, e.g. change run-view-icon.fontCharacter from \\e002 tp \\e001

• the run view icon in the ext host window will change as you update the file (no reload needed)

• use code completion in the theme file to look at more icons.
  Tester 1: debug icons, e.g debug-breakpoint
  Tester 2: extensions icons, e.g extensions-manage
  Tester 3: notebook icons, e.g notebook-execute
  ⚠️ notebookIcons have just been pushed, so need a new build from today

• verify that all icons have descriptions in code assist and hover in the theme file. Test that the descriptions are understandable.

• test that you can change some of the icons.
  (note that the font of the sample theme has only a limited number of glyphs (e000-e009, see product-icon-theme-sample/theme/vscode-10.html. The sample lets you add more icons, but that's not necessary to test)

Full list of icons can be found in
https://github.com/microsoft/vscode-docs/blob/vnext/api/references/icons-in-labels.md#L16