From 1023d3ddaa75072806f6d11c7b434ed031ea14c1 Mon Sep 17 00:00:00 2001
From: ocornut <omar@miracleworld.net>
Date: Fri, 30 Oct 2026 17:32:06 +0100
Subject: [PATCH] InputText: fixed ImGuiInputTextCallbackData::InsertChars()
 mistakenly over growing internal buffer. (#9603, #7925)

Note that the 32-256 ranges may seem misleading because ImVector<> handle its growth policy but it is also the size we request to underlying user impl hence the clamps.
---
 imgui_widgets.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 0b862b437..f36a888c2 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@@ -4471,7 +4471,7 @@ void ImGuiInputTextCallbackData::InsertChars(int pos, const char* new_text, cons
     if (new_text_len + BufTextLen + 1 > obj->TextA.Size && is_resizable && !is_readonly)
     {
         IM_ASSERT(Buf == obj->TextA.Data);
-        int new_buf_size = BufTextLen + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1;
+        int new_buf_size = BufTextLen + ImClamp(new_text_len, 32, ImMax(256, new_text_len)) + 1;
         obj->TextA.resize(new_buf_size + 1);
         obj->TextSrc = obj->TextA.Data;
         Buf = obj->TextA.Data;