Fix section ordering with many same-named sections

Before, this was comparing, for example, `.text-2`
with `.text-10` with standard string comparison,
yielding `.text-10` before `.text-2`.

Instead, this simply uses a stable sort by name,
which preserves the relative ordering of sections.

objdiff-core/tests/arch_x86.rs

@@ -1,4 +1,4 @@
-use objdiff_core::{diff, obj};
+use objdiff_core::{diff, diff::display::SymbolFilter, obj};
 
 mod common;
 
@@ -40,3 +40,18 @@ fn read_x86_64() {
     let output = common::display_diff(&obj, &diff, symbol_idx, &diff_config);
     insta::assert_snapshot!(output);
 }
+
+#[test]
+#[cfg(feature = "x86")]
+fn display_section_ordering() {
+    let diff_config = diff::DiffObjConfig::default();
+    let obj = obj::read::parse(include_object!("data/x86/basenode.obj"), &diff_config).unwrap();
+    let obj_diff =
+        diff::diff_objs(Some(&obj), None, None, &diff_config, &diff::MappingConfig::default())
+            .unwrap()
+            .left
+            .unwrap();
+    let section_display =
+        diff::display::display_sections(&obj, &obj_diff, SymbolFilter::None, false, false, false);
+    insta::assert_debug_snapshot!(section_display);
+}