fix: Don't remove file paths from full traces

`Full()` was accidentally dropping the file names from the full traces.

internal/stack/stacks.go

@@ -137,10 +137,6 @@ func (p *stackParser) parseStack(line string) (Stack, error) {
 	funcs := make(map[string]struct{})
 	for p.scan.Scan() {
 		line := p.scan.Text()
-		if len(line) == 0 {
-			continue
-		}
-
 		if strings.HasPrefix(line, "goroutine ") {
 			// If we see the goroutine header,
 			// it's the end of this stack.
@@ -152,6 +148,10 @@ func (p *stackParser) parseStack(line string) (Stack, error) {
 		fullStack.WriteString(line)
 		fullStack.WriteByte('\n') // scanner trims the newline
 
+		if len(line) == 0 {
+			continue
+		}
+
 		funcName, err := parseFuncName(line)
 		if err != nil {
 			return Stack{}, fmt.Errorf("parse function: %w", err)
@@ -170,6 +170,8 @@ func (p *stackParser) parseStack(line string) (Stack, error) {
 		if p.scan.Scan() {
 			bs := p.scan.Bytes()
 			if len(bs) > 0 && bs[0] == '\t' {
+				fullStack.Write(bs)
+				fullStack.WriteByte('\n')
 				continue
 			}
 

internal/stack/stacks_test.go

@@ -105,6 +105,9 @@ func TestCurrent(t *testing.T) {
 	assert.True(t, got.HasFunction("testing.(*T).Run"),
 		"missing in stack: %v\n%s", "testing.(*T).Run", all)
 
+	assert.Contains(t, all, "stack/stacks_test.go",
+		"file name missing in stack:\n%s", all)
+
 	// Ensure that we are not returning the buffer without slicing it
 	// from getStackBuffer.
 	if len(got.Full()) > 1024 {