[LyX/master] Pass variable by reference to avoid copy (spotted by Coverity Scan)

[Jean-Marc Lasgouttes]

commit f1e01dc0cf00e8865aa65584c573cce86ef86713
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Sat Mar 1 21:45:05 2025 +0100

    Pass variable by reference to avoid copy (spotted by Coverity Scan)
---
 src/frontends/qt/ColorsCombo.cpp | 2 +-
 src/frontends/qt/ColorsCombo.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt/ColorsCombo.cpp b/src/frontends/qt/ColorsCombo.cpp
index 1beeb4f201..734df200f8 100644
--- a/src/frontends/qt/ColorsCombo.cpp
+++ b/src/frontends/qt/ColorsCombo.cpp
@@ -101,7 +101,7 @@ void ColorsCombo::addItemSort(QString const & item, QString 
const & guiname,
 }
 
 
-void ColorsCombo::setCustomColors(std::map<std::string, std::string> const 
custom_colors)
+void ColorsCombo::setCustomColors(std::map<std::string, std::string> const & 
custom_colors)
 {
        custom_colors_ = custom_colors;
        fillComboColor();
diff --git a/src/frontends/qt/ColorsCombo.h b/src/frontends/qt/ColorsCombo.h
index 88d3cafa2f..71f8f143c7 100644
--- a/src/frontends/qt/ColorsCombo.h
+++ b/src/frontends/qt/ColorsCombo.h
@@ -39,7 +39,7 @@ public:
        void addItemSort(QString const & item, QString const & guiname,
                         QString const & category, QString color = QString());
        /// Set BufferParams to access custom colors
-       void setCustomColors(std::map<std::string, std::string> const 
custom_colors);
+       void setCustomColors(std::map<std::string, std::string> const & 
custom_colors);
        /// Add "ignore" color entry?
        void hasIgnore(bool const b) { has_ignore_ = b; }
        /// Add "inherit" color entry?
-- 
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