Fixes #78262

src/vs/editor/browser/controller/mouseTarget.ts

@@ -16,6 +16,7 @@ import { Range as EditorRange } from 'vs/editor/common/core/range';
 import { HorizontalRange } from 'vs/editor/common/view/renderingContext';
 import { ViewContext } from 'vs/editor/common/view/viewContext';
 import { IViewModel } from 'vs/editor/common/viewModel/viewModel';
+import { CursorColumns } from 'vs/editor/common/controller/cursorCommon';
 
 export interface IViewZoneData {
 	viewZoneId: number;
@@ -410,7 +411,7 @@ class HitTestRequest extends BareHitTestRequest {
 		let mouseColumn = this.mouseColumn;
 		if (position && position.column < this._ctx.model.getLineMaxColumn(position.lineNumber)) {
 			// Most likely, the line contains foreign decorations...
-			mouseColumn = position.column;
+			mouseColumn = CursorColumns.visibleColumnFromColumn(this._ctx.model.getLineContent(position.lineNumber), position.column, this._ctx.model.getOptions().tabSize) + 1;
 		}
 		return new MouseTarget(this.target, type, mouseColumn, position, range, detail);
 	}