Support C++17 fallthrough attribute

Replaces our mix of comments for annotating intended absence of break
in switches with the C++17 attribute [[fallthrough]], or its earlier
a clang extension counterpart.

Change-Id: I4b2d0b9b5e4425819c7f1bf01608093c536b6d14
Reviewed-by: Thiago Macieira <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/text/qtextdocumentfragment.cpp b/src/gui/text/qtextdocumentfragment.cpp
index 5727b34e86f..079b2e01f7f 100644
--- a/src/gui/text/qtextdocumentfragment.cpp
+++ b/src/gui/text/qtextdocumentfragment.cpp
@@ -827,7 +827,7 @@ bool QTextHtmlImporter::closeTag()
             case Html_div:
                 if (closedNode->children.isEmpty())
                     break;
-                // fall through
+                Q_FALLTHROUGH();
             default:
                 if (closedNode->isBlock())
                     blockTagClosed = true;