Use CSS variables over registerThemingParticipant - minimap viewparts (microsoft#165465)

* Replace Theme register participant with the CSS variables

Author: slrico

src/vs/editor/browser/viewParts/minimap/minimap.css

@@ -15,7 +15,18 @@
 	opacity: 1;
 }
 /* END cover the case that slider is visible on mouseover */
-
+.monaco-editor .minimap-slider .minimap-slider-horizontal {
+	color: var(--vscode-minimapSlider-background);
+}
+.monaco-editor .minimap-slider:hover .minimap-slider-horizontal {
+	color: var(--vscode-minimapSlider-hoverBackground);
+}
+.monaco-editor .minimap-slider.active .minimap-slider-horizontal {
+	color: var(--vscode-minimapSlider-activeBackground);
+}
+.monaco-editor .minimap-shadow-visible {
+	box-shadow: var(--vscode-minimap-shadow) -6px 0 6px -6px inset;
+}
 .monaco-editor .minimap-shadow-hidden {
 	position: absolute;
 	width: 0;
@@ -33,9 +44,9 @@
 
 /* 0.5s fade in/out for the minimap */
 .minimap.autohide {
-	opacity: 0.0;
+	opacity: 0;
 	transition: opacity 0.5s;
 }
 .minimap.autohide:hover {
-	opacity: 1.0;
+	opacity: 1;
 }

src/vs/editor/browser/viewParts/minimap/minimap.ts

@@ -27,8 +27,7 @@ import { ViewContext } from 'vs/editor/common/viewModel/viewContext';
 import { EditorTheme } from 'vs/editor/common/editorTheme';
 import * as viewEvents from 'vs/editor/common/viewEvents';
 import { ViewLineData, ViewModelDecoration } from 'vs/editor/common/viewModel';
-import { minimapSelection, scrollbarShadow, minimapBackground, minimapSliderBackground, minimapSliderHoverBackground, minimapSliderActiveBackground, minimapForegroundOpacity } from 'vs/platform/theme/common/colorRegistry';
-import { registerThemingParticipant } from 'vs/platform/theme/common/themeService';
+import { minimapSelection, minimapBackground, minimapForegroundOpacity } from 'vs/platform/theme/common/colorRegistry';
 import { ModelDecorationMinimapOptions } from 'vs/editor/common/model/textModel';
 import { Selection } from 'vs/editor/common/core/selection';
 import { Color } from 'vs/base/common/color';
@@ -2000,21 +1999,3 @@ class ContiguousLineMap<T> {
 	}
 }
 
-registerThemingParticipant((theme, collector) => {
-	const sliderBackground = theme.getColor(minimapSliderBackground);
-	if (sliderBackground) {
-		collector.addRule(`.monaco-editor .minimap-slider .minimap-slider-horizontal { background: ${sliderBackground}; }`);
-	}
-	const sliderHoverBackground = theme.getColor(minimapSliderHoverBackground);
-	if (sliderHoverBackground) {
-		collector.addRule(`.monaco-editor .minimap-slider:hover .minimap-slider-horizontal { background: ${sliderHoverBackground}; }`);
-	}
-	const sliderActiveBackground = theme.getColor(minimapSliderActiveBackground);
-	if (sliderActiveBackground) {
-		collector.addRule(`.monaco-editor .minimap-slider.active .minimap-slider-horizontal { background: ${sliderActiveBackground}; }`);
-	}
-	const shadow = theme.getColor(scrollbarShadow);
-	if (shadow) {
-		collector.addRule(`.monaco-editor .minimap-shadow-visible { box-shadow: ${shadow} -6px 0 6px -6px inset; }`);
-	}
-});