[LyX/master] Add move constructor and assignment operator for Inset

[Jean-Marc Lasgouttes]

commit 6d2747acb6e760ba1c68a7096bface8de50a0504
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Tue Apr 8 17:31:48 2025 +0200

    Add move constructor and assignment operator for Inset
    
    This is useless in practice, but Coverity Scan wants it.
---
 src/insets/Inset.cpp | 15 +++++++++++++++
 src/insets/Inset.h   |  5 ++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/insets/Inset.cpp b/src/insets/Inset.cpp
index c3efc2b5f2..f55c3e65d7 100644
--- a/src/insets/Inset.cpp
+++ b/src/insets/Inset.cpp
@@ -185,6 +185,21 @@ static void build_translator()
        passed = true;
 }
 
+Inset & Inset::operator=(Inset const & in)
+{
+       if (&in != this)
+               buffer_ = nullptr;
+       return *this;
+}
+
+
+Inset & Inset::operator=(Inset && in)
+{
+       if (&in != this)
+               buffer_ = nullptr;
+       return *this;
+}
+
 
 void Inset::setBuffer(Buffer & buffer)
 {
diff --git a/src/insets/Inset.h b/src/insets/Inset.h
index 226732b413..d41c339ebb 100644
--- a/src/insets/Inset.h
+++ b/src/insets/Inset.h
@@ -634,7 +634,10 @@ public:
 protected:
        /// Constructors
        Inset(Buffer * buf) : buffer_(buf) {}
-       Inset(Inset const &) : buffer_(0) {}
+       Inset(Inset const &) : buffer_(nullptr) {}
+       Inset(Inset &&) : buffer_(nullptr) {}
+       Inset & operator=(Inset const &);
+       Inset & operator=(Inset &&);
 
        /// replicate ourselves
        friend class InsetList;
-- 
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