[LyX features/intertext] Amend b1a6edcd77bdb for intitle commands

[Juergen Spitzmueller]

commit 6dda5b342bad5425b8a1e1723d259506bdc70b87
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Thu May 15 13:34:46 2025 +0200

    Amend b1a6edcd77bdb for intitle commands
---
 src/output_latex.cpp | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/output_latex.cpp b/src/output_latex.cpp
index b804cf4f2f..340720f846 100644
--- a/src/output_latex.cpp
+++ b/src/output_latex.cpp
@@ -320,7 +320,9 @@ static TeXEnvironmentData prepareEnvironment(Buffer const & 
buf,
                        rp.local_font = &pit->getFirstFontSettings(bparams);
                        latexArgInsets(paragraphs, pit, os, rp, 
style.latexargs());
                }
-               os << from_ascii(style.latexparam()) << "{%";
+               os << from_ascii(style.latexparam()) << '{';
+               if (!style.intitle)
+                       os << '%';
        }
        data.style = &style;
 
@@ -873,6 +875,7 @@ void TeXOnePar(Buffer const & buf,
 
        Paragraph const * nextpar = runparams.isLastPar
                ? nullptr : &paragraphs.at(pit + 1);
+       Paragraph const * priorpar = (pit == 0) ? nullptr : &paragraphs.at(pit 
- 1);
 
        bool const intitle_command = style.intitle && style.isCommand();
        // Intitle commands switch languages locally, thus increase
@@ -889,15 +892,19 @@ void TeXOnePar(Buffer const & buf,
                        // are output after this command (#2154)
                        runparams.postpone_fragile_stuff =
                                bparams.postpone_fragile_content;
-               if (intitle_command)
-                       os << '{';
+               if (intitle_command) {
+                       if (style.isMultiparCommand() && priorpar && 
priorpar->hasSameLayout(par))
+                               os << '\n' << '\n';
+                       else if (!style.isMultiparCommand())
+                               os << '{';
+               }
 
                par.latex(bparams, outerfont, os, runparams, start_pos, 
end_pos, force);
 
                // I did not create a parEndCommand for this minuscule
                // task because in the other user of parStartCommand
                // the code is different (JMarc)
-               if (style.isCommand()) {
+               if (style.isCommand() && !style.isMultiparCommand()) {
                        os << "}";
                        if (!runparams.no_cprotect && 
par.needsCProtection(runparams.moving_arg)
                            && contains(runparams.active_chars, '^'))
@@ -907,15 +914,15 @@ void TeXOnePar(Buffer const & buf,
                        else
                                os << "\n";
                }
-               else if (!merged_par)
+               else if (!merged_par && !style.isMultiparCommand())
                        os << '\n';
-               if (!style.parbreak_is_newline && !merged_par) {
+               if (!style.parbreak_is_newline && !merged_par && 
!style.isMultiparCommand()) {
                        os << '\n';
                } else if (nextpar && !style.isEnvironment()) {
                        Layout const nextstyle = text.inset().forcePlainLayout()
                                ? bparams.documentClass().plainLayout()
                                : nextpar->layout();
-                       if (nextstyle.name() != style.name() && !merged_par)
+                       if (nextstyle.name() != style.name() && !merged_par && 
!style.isMultiparCommand())
                                os << '\n';
                }
 
@@ -934,8 +941,6 @@ void TeXOnePar(Buffer const & buf,
                (runparams.local_font != nullptr) ?
                        runparams.local_font->language() : doc_language;
 
-       Paragraph const * priorpar = (pit == 0) ? nullptr : &paragraphs.at(pit 
- 1);
-
        // The previous language that was in effect is the language of the
        // previous paragraph, unless the previous paragraph is inside an
        // environment with nesting depth greater than (or equal to, but with
@@ -1006,7 +1011,10 @@ void TeXOnePar(Buffer const & buf,
                        // are output after this command (#2154)
                        runparams.postpone_fragile_stuff =
                                bparams.postpone_fragile_content;
-               os << '{';
+               if (!style.isMultiparCommand())
+                       os << '{';
+               else if (priorpar && priorpar->hasSameLayout(par))
+                       os << '\n';
        }
 
        // In some insets (such as Arguments), we cannot use \selectlanguage.
-- 
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