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GtkTag's paragraph-background property doesn't apply to empty newlines

Steps to reproduce

  1. Ad a GtkTag to some text including newlines
  2. Set its paragraph-background property to any color

Current behavior

Lines with just a \n don't have the background color

Expected outcome

All lines to be filled, independent on their content

Version information

  • GTK 4.16.5
  • Fedora 41
  • Wayland

Additional information

Reproducer

#include <gtk/gtk.h>

static void
activate (GtkApplication* app,
          gpointer        user_data)
{
  GtkWidget *window;
  GtkWidget *textview;
  GtkTextBuffer *buffer;
  GtkTextTag *tag;
  GtkTextIter start, end;
  

  window = gtk_application_window_new (app);
  textview = gtk_text_view_new ();
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview));
  tag = gtk_text_buffer_create_tag(buffer, "colored_paragraph", "paragraph-background", "pink");
  
  gtk_text_buffer_set_text(buffer, "bob\n\nalice\ntest", -1);
  gtk_text_buffer_get_bounds (buffer, &start, &end);
  gtk_text_buffer_apply_tag(buffer, tag, &start, &end);
  
  gtk_window_set_child (GTK_WINDOW (window), textview);

  gtk_window_set_title (GTK_WINDOW (window), "Window");
  gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
  gtk_window_present (GTK_WINDOW (window));
}

int
main (int    argc,
      char **argv)
{
  GtkApplication *app;
  int status;

  app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  status = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);

  return status;
}
gcc $( pkg-config --cflags gtk4 ) -o run main.c $( pkg-config --libs gtk4 )
./run