[LyX/master] Improve \includeonly support

[Juergen Spitzmueller]

commit b2a896f2f8a363f8928986b5940464b8fd515f50
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sun Jun 28 16:30:28 2026 +0200

    Improve \includeonly support
    
    It _is_ possible to exclude all (empty \includeonly) as well as to
    include all. So let us allow this.
---
 src/BufferParams.cpp             |  2 ++
 src/frontends/qt/GuiDocument.cpp | 37 ++++++++++++-------------------------
 src/frontends/qt/GuiDocument.h   |  2 +-
 3 files changed, 15 insertions(+), 26 deletions(-)

diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index 88c37e26a4..6e8abdf2ac 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -2432,6 +2432,8 @@ bool BufferParams::writeLaTeX(otexstream & os, LaTeXFeatures & features,
 		// we do not use "auto const &" here, because incfile is modified later
 		// coverity[auto_causes_copy]
 		for (auto incfile : included_children_) {
+			if (incfile == "@none@")
+				continue;
 			FileName inc = makeAbsPath(incfile, filepath.absFileName());
 			string mangled = DocFileName(changeExtension(inc.absFileName(), ".tex")).
 					mangledFileName();
diff --git a/src/frontends/qt/GuiDocument.cpp b/src/frontends/qt/GuiDocument.cpp
index 3c8b62050c..f25fa5e572 100644
--- a/src/frontends/qt/GuiDocument.cpp
+++ b/src/frontends/qt/GuiDocument.cpp
@@ -2169,15 +2169,12 @@ void GuiDocument::includeonlyClicked(QTreeWidgetItem * item, int)
 
 	if (isChildIncluded(child))
 		includeonlys_.remove(child);
-	else
+	else {
+		includeonlys_.remove("@none@");
 		includeonlys_.push_back(child);
+	}
 
-	if (int(includeonlys_.size()) == masterChildModule->childrenTW->topLevelItemCount())
-		Alert::warning(_("All children selected!"),
-			_("If not at least one child is excluded, "
-			  "this will be reset to 'Include all children' "
-			  "after application."));
-	updateIncludeonlys(false);
+	updateIncludeonlys();
 	change_adaptor();
 }
 
@@ -3994,9 +3991,13 @@ void GuiDocument::applyView()
 	bp_.clearIncludedChildren();
 	updateIncludeonlys();
 	if (masterChildModule->includeonlyRB->isChecked()) {
-		list<string>::const_iterator it = includeonlys_.begin();
-		for (; it != includeonlys_.end() ; ++it) {
-			bp_.addIncludedChildren(*it);
+		if (includeonlys_.empty())
+			bp_.addIncludedChildren("@none@");
+		else {
+			list<string>::const_iterator it = includeonlys_.begin();
+			for (; it != includeonlys_.end() ; ++it) {
+				bp_.addIncludedChildren(*it);
+			}
 		}
 	}
 	if (masterChildModule->maintainCRNoneRB->isChecked())
@@ -4963,10 +4964,6 @@ void GuiDocument::updateIncludeonlyDisplay()
 {
 	if (includeonlys_.empty()) {
 		masterChildModule->includeallRB->setChecked(true);
-		// Disable "Include selected only" if there is
-		// only one to select from
-		masterChildModule->includeonlyRB->setEnabled(
-			masterChildModule->childrenTW->topLevelItemCount() > 1);
 		masterChildModule->childrenTW->setEnabled(false);
 		masterChildModule->maintainGB->setEnabled(false);
 	} else {
@@ -4977,7 +4974,7 @@ void GuiDocument::updateIncludeonlyDisplay()
 }
 
 
-void GuiDocument::updateIncludeonlys(bool const cleanup)
+void GuiDocument::updateIncludeonlys()
 {
 	masterChildModule->childrenTW->clear();
 	QString const no = qt_("No");
@@ -4986,8 +4983,6 @@ void GuiDocument::updateIncludeonlys(bool const cleanup)
 	ListOfBuffers children = buffer().getChildren();
 	ListOfBuffers::const_iterator it  = children.begin();
 	ListOfBuffers::const_iterator end = children.end();
-	bool has_unincluded = false;
-	bool all_unincluded = true;
 	for (; it != end; ++it) {
 		QTreeWidgetItem * item = new QTreeWidgetItem(masterChildModule->childrenTW);
 		// FIXME Unicode
@@ -4996,15 +4991,7 @@ void GuiDocument::updateIncludeonlys(bool const cleanup)
 							from_utf8(buffer().filePath())));
 		item->setText(0, toqstr(name));
 		item->setText(1, isChildIncluded(name) ? yes : no);
-		if (!isChildIncluded(name))
-			has_unincluded = true;
-		else
-			all_unincluded = false;
 	}
-	// Both if all children are included and if none is included
-	// is equal to "include all" (i.e., omit \includeonly).
-	if (cleanup && (!has_unincluded || all_unincluded))
-		includeonlys_.clear();
 }
 
 
diff --git a/src/frontends/qt/GuiDocument.h b/src/frontends/qt/GuiDocument.h
index 686ab5a1ed..d7eae7b632 100644
--- a/src/frontends/qt/GuiDocument.h
+++ b/src/frontends/qt/GuiDocument.h
@@ -232,7 +232,7 @@ private:
 	///
 	void updateIncludeonlyDisplay();
 	///
-	void updateIncludeonlys(bool const cleanup = true);
+	void updateIncludeonlys();
 	///
 	void updateDefaultBiblio(std::string const & style,
 				 std::string const & which = std::string());