[LyX/master] Add proper support for BabelProvide 2

[Juergen Spitzmueller]

commit fc605cf138cbb64431182b5684eb83981867f81a
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sun Aug 25 14:56:05 2024 +0200

    Add proper support for BabelProvide 2
    
    We need to instruct babel not to load an existing ldf in this case
---
 lib/languages          |  1 +
 lib/lyx2lyx/lyx_2_5.py |  5 +++++
 src/BufferParams.cpp   | 25 ++++++++++++++++++++++---
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/lib/languages b/lib/languages
index a29d2470ef..6ed813da18 100644
--- a/lib/languages
+++ b/lib/languages
@@ -891,6 +891,7 @@ Language hebrew
 	GuiName          "Hebrew"
 	HasGuiSupport    true
 	BabelName        hebrew
+	BabelProvide     2
 	PolyglossiaName  hebrew
 	XindyName        hebrew
 	Encoding         cp1255
diff --git a/lib/lyx2lyx/lyx_2_5.py b/lib/lyx2lyx/lyx_2_5.py
index fa9641c5c9..ef9d4afd44 100644
--- a/lib/lyx2lyx/lyx_2_5.py
+++ b/lib/lyx2lyx/lyx_2_5.py
@@ -1010,6 +1010,11 @@ def revert_new_babel_languages(document):
     if have_oldrussian:
         add_to_preamble(document, ["\\AddToHook{package/babel/after}{\\languageattribute{russian}{ancient}}"])
 
+    # Some babel languages require special treatment with unicode engines
+    if get_bool_value(document.header, "\\use_non_tex_fonts"):
+        if document.language == "hebrew" or find_token(document.body, "\\lang oldrussian", 0) != -1:
+            add_to_preamble(document, ["\\PassOptionsToPackage{provide*=*}{babel}"])
+
 ##
 # Conversion hub
 #
diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index 5930aaf7b9..3115e6b03b 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -3504,6 +3504,7 @@ string BufferParams::babelCall(LaTeXFeatures const & features, string lang_opts,
 	// add main language
 	langs.insert(language);
 	ostringstream os;
+	string force_provide;
 	for (auto const & l : langs) {
 		string blang = l->babel();
 		bool use_opt = langoptions;
@@ -3523,7 +3524,8 @@ string BufferParams::babelCall(LaTeXFeatures const & features, string lang_opts,
 				use_opt = true;
 			}
 		}
-		if (l->useBabelProvide() == 1 || (l->useBabelProvide() == 2 && useNonTeXFonts)) {
+		int const bp = l->useBabelProvide();
+		if (bp == 1) {
 			os << "\n\\babelprovide[import";
 			if (l == language)
 				os << ", main";
@@ -3532,11 +3534,28 @@ string BufferParams::babelCall(LaTeXFeatures const & features, string lang_opts,
 			os << "]{" << blang << "}";
 			have_mods = true;
 		}
-		else if (use_opt)
+		if (bp == 2 && useNonTeXFonts) {
+			// here we need to tell babel to use the ini
+			// even though an *.ldf exists
+			if (l == language)
+				force_provide = force_provide.empty()
+						? "provide=*"
+						: "provide*=*";
+			else
+				force_provide = "provide+=*";
+			have_mods = true;
+		}
+		if (bp != 1 && use_opt)
 			blangs.push_back(blang);
 	}
-	if (have_mods)
+	if (have_mods) {
 		lang_opts = getStringFromVector(blangs);
+		if (!force_provide.empty()) {
+			if (!lang_opts.empty())
+				lang_opts += ", ";
+			lang_opts += force_provide;
+		}
+	}
 	// The prefs may require the languages to
 	// be submitted to babel itself (not the class).
 	if ((langoptions || have_mods) && !lang_opts.empty())