Use CSS classes on html list items for checkbox support

If we replace the bullet character with a UC checkbox character, it
looks ok in a browser, and the HTML parser can recover the BlockMarker
attribute from the css class.

[ChangeLog][QtGui][Text] Checkbox list items can now be read and written
in both HTML and Markdown, including conversions.

Task-number: QTBUG-103714
Change-Id: Ic6b74512075cd4ac16d6f80fdf55b221447491a9
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/text/qtexthtmlparser.cpp b/src/gui/text/qtexthtmlparser.cpp
index a10b880886..ded2dd185a 100644
--- a/src/gui/text/qtexthtmlparser.cpp
+++ b/src/gui/text/qtexthtmlparser.cpp
@@ -1636,6 +1636,14 @@ void QTextHtmlParser::applyAttributes(const QStringList &attributes)
                     }
                 }
                 break;
+            case Html_li:
+                if (key == "class"_L1) {
+                    if (value == "unchecked"_L1)
+                        node->blockFormat.setMarker(QTextBlockFormat::MarkerType::Unchecked);
+                    else if (value == "checked"_L1)
+                        node->blockFormat.setMarker(QTextBlockFormat::MarkerType::Checked);
+                }
+                break;
             case Html_a:
                 if (key == "href"_L1)
                     node->charFormat.setAnchorHref(value);