[LyX/2.4.x] Disable language package choice if the class preloads a package

[Juergen Spitzmueller]

commit d29baf59a4a69ad022bca7ee63b3512838b295a2
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Apr 13 10:07:18 2024 +0200

    Disable language package choice if the class preloads a package
    
    (cherry picked from commit 5477451e36cd9ff4e99aefea2627fbf63e028004)
---
 src/frontends/qt/GuiDocument.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt/GuiDocument.cpp b/src/frontends/qt/GuiDocument.cpp
index d4471cff7b..e020ab92c2 100644
--- a/src/frontends/qt/GuiDocument.cpp
+++ b/src/frontends/qt/GuiDocument.cpp
@@ -4217,15 +4217,30 @@ void GuiDocument::paramsToDialog()
 
        // LaTeX input encoding: set after the fonts (see below)
 
-       int p = 
langModule->languagePackageCO->findData(toqstr(bp_.lang_package));
+       // If the class provides babel or polyglossia, do not allow
+       // to change that
+       bool const extern_babel =
+               documentClass().provides("babel");
+       bool const extern_polyglossia =
+               documentClass().provides("polyglossia");
+
+       int p = -1;
+       if (extern_babel)
+               p = langModule->languagePackageCO->findData(toqstr("babel"));
+       else if (extern_polyglossia)
+               p = 
langModule->languagePackageCO->findData(toqstr("polyglossia"));
+       else
+               p = 
langModule->languagePackageCO->findData(toqstr(bp_.lang_package));
+
        if (p == -1) {
                langModule->languagePackageCO->setCurrentIndex(
-                         langModule->languagePackageCO->findData("custom"));
+                       langModule->languagePackageCO->findData("custom"));
                
langModule->languagePackageLE->setText(toqstr(bp_.lang_package));
        } else {
                langModule->languagePackageCO->setCurrentIndex(p);
                langModule->languagePackageLE->clear();
        }
+       langModule->languagePackageCO->setEnabled(!extern_babel && 
!extern_polyglossia);
 
        //color
        if (bp_.isfontcolor) {
-- 
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