Test case triggering issue described in #379

#379 (comment)

tests_regression/sphinx/test-customtemplate/conf.py

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+# Configuration file for the Sphinx documentation builder.
+#
+# For the full list of built-in configuration values, see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Project information -----------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
+
+project = 'Custom Template'
+copyright = '1999, Author'
+author = 'Author'
+
+# -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
+
+extensions = []
+
+templates_path = ['_templates']
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+
+# -- Options for rinohtype PDF output ----------------------------------------
+
+import os
+import sys
+
+sys.path.insert(0, os.path.abspath('.'))
+
+import mytemplate
+
+rinoh_documents = [dict(
+    doc='index',
+    target='customtemplate',
+    template='mytemplate.rtt',
+)]

tests_regression/sphinx/test-customtemplate/index.rst

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+Rear Cover Page
+===============
+
+Hello!

tests_regression/sphinx/test-customtemplate/mystylesheet.rts

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+[STYLESHEET]
+name=Custom
+base=sphinx
+description=The Sphinx stylesheet, but using core PDF fonts
+
+[VARIABLES]
+mono_typeface=Courier
+serif_typeface=Times
+sans_typeface=Helvetica
+
+[title page date : Paragraph('title page date')]
+hide = true

tests_regression/sphinx/test-customtemplate/mytemplate.py

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+from pathlib import Path
+
+from rinoh import register_template
+from rinoh.attribute import OverrideDefault
+from rinoh.dimension import CM, PT
+from rinoh.image import Image
+from rinoh.layout import CONTENT, DownExpandingContainer, UpExpandingContainer
+from rinoh.paragraph import Paragraph
+from rinoh.template import (DocumentTemplate, DocumentPartTemplate,
+                            PageBase, PageTemplateBase)
+from rinoh.templates import Book
+from rinoh.text import StyledText
+
+
+class RearCoverPageTemplate(PageTemplateBase):
+    def page(self, document_part, page_number, chain):
+        return RearCoverPage(document_part, self, page_number)
+
+
+REAR_COVER_PAGE_TEXT = r"""
+'Some '(style 1) 'Text\n'(style 2)
+'Some '(style 1) 'Text'(style 2)
+""".replace('\n', '') # work around rinohtype bug
+
+
+class RearCoverPage(PageBase):
+    configuration_class = RearCoverPageTemplate
+
+    def __init__(self, document_part, template, page_number):
+        super().__init__(document_part, template, page_number)
+        margin = 2*CM
+        split = 20*CM
+        width = self.width - 2 * margin
+        self.text = UpExpandingContainer('text', CONTENT, self, left=margin,
+                                         bottom=split, width=width)
+        self.text << Paragraph(StyledText.from_string(REAR_COVER_PAGE_TEXT),
+                               style='rear cover page text')
+        self.imgs = DownExpandingContainer('images', CONTENT, self,
+                                           left=margin, top=split, width=width)
+        self.imgs << Image(Path(__file__).parent / 'rear_page_1.png',
+                           width=2*CM, align='right')
+        self.imgs << Image(Path(__file__).parent / 'rear_page_2.png',
+                           width=2*CM, align='right')
+
+
+class RearCoverPartTemplate(DocumentPartTemplate):
+    drop_if_empty = OverrideDefault(False)
+
+    def _flowables(self, document):
+        return iter([])     # content is static, placed in RearCoverPage
+
+
+class MyDocumentTemplate(Book):
+    parts = OverrideDefault(['title', 'front_matter', 'contents', 'back_matter',
+                             'rear_cover'])
+    rear_cover = RearCoverPartTemplate()
+    rear_cover_page = RearCoverPageTemplate(base='page')
+
+register_template('my_template', MyDocumentTemplate)

tests_regression/sphinx/test-customtemplate/mytemplate.rtt

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+[TEMPLATE_CONFIGURATION]
+name=my template configuration
+template=my_template
+stylesheet=mystylesheet.rts
+
+[rear_cover_page]
+background = 'rear_page_bg.png', scale=fit

tests_regression/sphinx/test-customtemplate/rear_page_1.png

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+../../images/title.png

tests_regression/sphinx/test-customtemplate/rear_page_2.png

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+../../images/biohazard.png

tests_regression/sphinx/test-customtemplate/rear_page_bg.png

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+../../images/title.png