mark listing entry when details are visible

tests/test_samurai_core_spec.lua

@@ -1006,6 +1006,17 @@ describe("test-samurai core (no bundled runners)", function()
     local detail_buf = vim.api.nvim_get_current_buf()
     local detail_lines = vim.api.nvim_buf_get_lines(detail_buf, 0, -1, false)
     assert.same({ "", "No output captured" }, detail_lines)
+    local selection_ns = vim.api.nvim_create_namespace("TestSamuraiListingSelection")
+    local marks = vim.api.nvim_buf_get_extmarks(listing_buf, selection_ns, 0, -1, { details = true })
+    assert.is_true(#marks > 0)
+    local highlighted = false
+    for _, mark in ipairs(marks) do
+      if mark[2] == target - 1 then
+        highlighted = true
+        break
+      end
+    end
+    assert.is_true(highlighted)
 
     vim.fn.jobstart = orig_jobstart
   end)