Detect no-op replaces and do not act on them

This avoids recording no-op undo groups.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/buffer.cc b/src/buffer.cc
index d065e02e..7a476264 100644
--- a/src/buffer.cc
+++ b/src/buffer.cc
@@ -613,6 +613,9 @@ BufferCoord Buffer::replace(BufferCoord begin, BufferCoord end, StringView conte
         content = content.substr(0, content.length() - 1);
     }
 
+    if (std::equal(iterator_at(begin), iterator_at(end), content.begin(), content.end()))
+        return begin;
+
     auto pos = erase(begin, end);
     return insert(pos, content);
 }