rstudio: add patch for Boost 1.86

I’m not going to bother trying to upstream this trivial fix since
they want full copyright assignment and a mailing address; it’s less
work for both parties for them to rederive it from scratch if and
when they get around to updating Boost themselves.

pkgs/applications/editors/rstudio/boost-1.86.patch

@@ -0,0 +1,13 @@
+diff --git a/src/cpp/core/json/JsonRpc.cpp b/src/cpp/core/json/JsonRpc.cpp
+index d034ffecd7..4b08486517 100644
+--- a/src/cpp/core/json/JsonRpc.cpp
++++ b/src/cpp/core/json/JsonRpc.cpp
+@@ -193,7 +193,7 @@
+
+ bool JsonRpcResponse::hasAfterResponse() const
+ {
+-   return afterResponse_;
++   return !afterResponse_.empty();
+ }
+
+

pkgs/applications/editors/rstudio/default.nix

@@ -6,7 +6,7 @@
 , makeDesktopItem
 , copyDesktopItems
 , cmake
-, boost183
+, boost
 , zlib
 , openssl
 , R
@@ -91,7 +91,7 @@ in
     ];
 
     buildInputs = [
-      boost183
+      boost
       zlib
       openssl
       R
@@ -124,8 +124,11 @@ in
       "-DQT_QMAKE_EXECUTABLE=${qmake}/bin/qmake"
     ];
 
-    # Hack RStudio to only use the input R and provided libclang.
     patches = [
+      # Fix build with Boost 1.86
+      ./boost-1.86.patch
+
+      # Hack RStudio to only use the input R and provided libclang.
       ./r-location.patch
       ./clang-location.patch
       ./use-system-node.patch