[LyX/master] Revert "Amend 35aa4bda"

[Enrico Forestieri]

commit 8be9c8b1583869174a2a02f3287993f90acc672e
Author: Enrico Forestieri <for...@lyx.org>
Date:   Sat Aug 2 22:43:38 2025 +0200

    Revert "Amend 35aa4bda"
    
    This reverts commit 6cd54aa6db9bb77426cfcd52b6154386bb9c1da7.
---
 src/LaTeXFeatures.cpp | 8 ++++++--
 src/LaTeXFeatures.h   | 2 ++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/LaTeXFeatures.cpp b/src/LaTeXFeatures.cpp
index 6e48c15e42..bccc79ef64 100644
--- a/src/LaTeXFeatures.cpp
+++ b/src/LaTeXFeatures.cpp
@@ -775,7 +775,11 @@ bool LaTeXFeatures::isProvided(string const & name) const
 
 bool LaTeXFeatures::mustProvide(string const & name) const
 {
-       return isRequired(name) && !isProvided(name);
+       if (isRequired(name) && !isProvided(name)) {
+               features_loaded_.insert(name);
+               return true;
+       }
+       return false;
 }
 
 
@@ -1609,7 +1613,7 @@ string const LaTeXFeatures::getPackages() const
        // Account for unknown packages mentioned in the Require tag
        // of layouts/custom insets
        for (string const & name : features_) {
-               if (!mustProvide(name))
+               if (features_loaded_.find(name) == features_loaded_.end())
                        packages << "\\usepackage{" << name << "}\n";
        }
 
diff --git a/src/LaTeXFeatures.h b/src/LaTeXFeatures.h
index 2d6fce25ca..2909a89e94 100644
--- a/src/LaTeXFeatures.h
+++ b/src/LaTeXFeatures.h
@@ -224,6 +224,8 @@ private:
        Features features_;
        /// Features that are provided
        Features provides_;
+       /// Already accounted for features
+       mutable Features features_loaded_;
        /// Static preamble bits, from external templates, or anywhere else
        typedef std::list<TexString> SnippetList;
        ///
-- 
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