Change themeColor to color in ThemeIcon api

Fixes #109459

src/vs/platform/theme/common/themeService.ts

@@ -25,7 +25,7 @@ export function themeColorFromId(id: ColorIdentifier) {
 // theme icon
 export interface ThemeIcon {
 	readonly id: string;
-	readonly themeColor?: ThemeColor;
+	readonly color?: ThemeColor;
 }
 
 export namespace ThemeIcon {

src/vs/vscode.d.ts

@@ -816,7 +816,7 @@ declare module 'vscode' {
 		/**
 		 * The optional ThemeColor of the icon. The color is currently only used in [TreeItem](#TreeItem).
 		 */
-		readonly themeColor?: ThemeColor;
+		readonly color?: ThemeColor;
 
 		/**
 		 * Creates a reference to a theme icon.

src/vs/workbench/api/common/extHostTypes.ts

@@ -2181,11 +2181,11 @@ export class ThemeIcon {
 	static Folder: ThemeIcon;
 
 	readonly id: string;
-	readonly themeColor?: ThemeColor;
+	readonly color?: ThemeColor;
 
 	constructor(id: string, color?: ThemeColor) {
 		this.id = id;
-		this.themeColor = color;
+		this.color = color;
 	}
 }
 ThemeIcon.File = new ThemeIcon('file');

src/vs/workbench/contrib/views/browser/treeView.ts

@@ -845,8 +845,8 @@ class TreeRenderer extends Disposable implements ITreeRenderer<ITreeItem, FuzzyS
 			let iconClass: string | undefined;
 			if (node.themeIcon && !this.isFileKindThemeIcon(node.themeIcon)) {
 				iconClass = ThemeIcon.asClassName(node.themeIcon);
-				if (node.themeIcon.themeColor) {
-					templateData.icon.style.color = this.themeService.getColorTheme().getColor(node.themeIcon.themeColor.id)?.toString() ?? '';
+				if (node.themeIcon.color) {
+					templateData.icon.style.color = this.themeService.getColorTheme().getColor(node.themeIcon.color.id)?.toString() ?? '';
 				}
 			}
 			templateData.icon.className = iconClass ? `custom-view-tree-node-item-icon ${iconClass}` : '';