Support for before & after decorations

[aeschli]

No description provided.

[aeschli]

You can use branch aeschli/css-decorators-test to see the API in use by css test extension

[aeschli]

@alexandrudima I made the changes we discussed:

• only one call to deltaDecorations
• beforeContentClassName & afterContentClassName on IModelDecorationOptions, creating extra decorations in viewModelDecorations.ts
• add 'border', 'outline', 'contentText', 'contextIconPath' to API

Still not sure if to enable SVG content. At the moment it is text and file path to an icon. We should maybe also allow URL to remote servers.

[siegebell]

vscode 1.3.0-insider; commit a6aa320

I'm using your feature with an injection attack (for display: none or font-size: 0pt; see #6201) to visually replace one string with another (#2402).

Here are a couple issues I'm seeing:

1. The before decoration does not work if its range is empty and it falls at the end of a line. The after decoration does not work if its range is empty and falls at the beginning of a line.
2. contentText does not preserve syntax coloring.

[egamma]

@siegebell thanks for the feedback, please file separate issues for the issues you have encountered.

[vasily-kirichenko]

@aeschli Is there documentation or usage examples available anywhere for this feature? I cannot find any.

[aeschli]

Sorry, no documentation besides the regular API doc.

A general sample code on decorators can be found here, and a use case of before decorators here.

[vasily-kirichenko]

@aeschli thanks!