Improve rendering for minimap blocks

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

@@ -1666,6 +1666,7 @@ class InnerMinimap extends Disposable {
 		const content = lineData.content;
 		const tokens = lineData.tokens;
 		const maxDx = target.width - charWidth;
+		const force1pxHeight = (minimapLineHeight === 1);
 
 		let dx = MINIMAP_GUTTER_WIDTH;
 		let charIndex = 0;
@@ -1697,9 +1698,9 @@ class InnerMinimap extends Disposable {
 
 					for (let i = 0; i < count; i++) {
 						if (renderMinimap === RenderMinimap.Blocks) {
-							minimapCharRenderer.blockRenderChar(target, dx, dy + innerLinePadding, tokenColor, backgroundColor, useLighterFont);
+							minimapCharRenderer.blockRenderChar(target, dx, dy + innerLinePadding, tokenColor, backgroundColor, useLighterFont, force1pxHeight);
 						} else { // RenderMinimap.Text
-							minimapCharRenderer.renderChar(target, dx, dy + innerLinePadding, charCode, tokenColor, backgroundColor, fontScale, useLighterFont, minimapLineHeight === 1);
+							minimapCharRenderer.renderChar(target, dx, dy + innerLinePadding, charCode, tokenColor, backgroundColor, fontScale, useLighterFont, force1pxHeight);
 						}
 
 						dx += charWidth;

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

@@ -82,11 +82,13 @@ export class MinimapCharRenderer {
 		dy: number,
 		color: RGBA8,
 		backgroundColor: RGBA8,
-		useLighterFont: boolean
+		useLighterFont: boolean,
+		force1pxHeight: boolean
 	): void {
 		const charWidth = Constants.BASE_CHAR_WIDTH * this.scale;
 		const charHeight = Constants.BASE_CHAR_HEIGHT * this.scale;
-		if (dx + charWidth > target.width || dy + charHeight > target.height) {
+		const renderHeight = (force1pxHeight ? 1 : charHeight);
+		if (dx + charWidth > target.width || dy + renderHeight > target.height) {
 			console.warn('bad render request outside image data');
 			return;
 		}
@@ -110,7 +112,7 @@ export class MinimapCharRenderer {
 		const dest = target.data;
 
 		let row = dy * destWidth + dx * Constants.RGBA_CHANNELS_CNT;
-		for (let y = 0; y < charHeight; y++) {
+		for (let y = 0; y < renderHeight; y++) {
 			let column = row;
 			for (let x = 0; x < charWidth; x++) {
 				dest[column++] = colorR;