Support variable line heights in the editor

[hediet]

This would allow to use larger font sizes for markdown headers.

[usernamehw]

@hediet Is this issue for TextMate grammar or editor decorations or both?

Grammar makes sense for markdown headers but editor decorations would be great too. For example, adding an image decoration (bigger than one line) without a webview (like code inset #85682).

[hediet]

It is not clear yet what mechanism will be used for that.

How would you add that image if you could set the line height? By using css?

[usernamehw]

It's already supported, the image is just very small (1 line).

In decoration options after.contentIconPath

---

Hmmm, actually it renders the full image ignoring width & height

window.activeTextEditor?.setDecorations(window.createTextEditorDecorationType({
	after: {
		contentIconPath: Uri.parse('https://random.imagecdn.app/500/150'),
		margin: '0 20ch',
		height: '2ch',
		width: '2ch',
	},
}), [new Range(0, 0, 0, 0)]);

[yume-chan]

Another use case would be shrinking empty lines #66468

Visual Studio has an extension (by Microsoft) to do that. https://marketplace.visualstudio.com/items?itemName=VisualStudioPlatformTeam.SyntacticLineCompression2022