src/vs/workbench/contrib/notebook/browser/diff/notebookDiffOverviewRuler.ts/NotebookDiffOverviewRuler/applyColors
class NotebookDiffOverviewRuler:	private applyColors(theme: IColorTheme): boolean {
		const newInsertColor = theme.getColor(diffOverviewRulerInserted) || (theme.getColor(diffInserted) || defaultInsertColor).transparent(2);
		const newRemoveColor = theme.getColor(diffOverviewRulerRemoved) || (theme.getColor(diffRemoved) || defaultRemoveColor).transparent(2);
		const hasChanges = !newInsertColor.equals(this._insertColor) || !newRemoveColor.equals(this._removeColor);
		this._insertColor = newInsertColor;
		this._removeColor = newRemoveColor;
		if (this._insertColor) {
			this._insertColorHex = Color.Format.CSS.formatHexA(this._insertColor);
		}

		if (this._removeColor) {
			this._removeColorHex = Color.Format.CSS.formatHexA(this._removeColor);
		}

		return hasChanges;
	}