imgui_stdlib: Fix warning (#6658)

misc/cpp/imgui_stdlib.cpp

diff --git a/misc/cpp/imgui_stdlib.cpp b/misc/cpp/imgui_stdlib.cpp
index c9060e8..cf69aa8 100644
--- a/misc/cpp/imgui_stdlib.cpp
+++ b/misc/cpp/imgui_stdlib.cpp
@@ -10,6 +10,12 @@
 #include "imgui.h"
 #include "imgui_stdlib.h"
 
+// Clang warnings with -Weverything
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#endif
+
 struct InputTextCallback_UserData
 {
     std::string*            Str;
@@ -73,3 +79,7 @@
     cb_user_data.ChainCallbackUserData = user_data;
     return InputTextWithHint(label, hint, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
 }
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif