[LyX/master] XHTML sections: only filter out things that are not Sectioning, not based on the level.

[Thibaut Cuvelier]

commit a85b4b88ed4e8e35ee8f6d976cc1a702a106c00f
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Sat Sep 19 03:23:00 2020 +0200

    XHTML sections: only filter out things that are not Sectioning, not based on the level.

 autotests/export/xhtml/zh_CN_Tutorial.lyx   |  974 +++++++++++++++++++++++++++
 autotests/export/xhtml/zh_CN_Tutorial.xhtml |  256 +++++++
 src/output_xhtml.cpp                        |    9 +-
 3 files changed, 1236 insertions(+), 3 deletions(-)