WebView: Add support for changing default background color

BUG: 390316

src/lib/webengine/webview.cpp

@@ -49,6 +49,7 @@
 #include <QScrollBar>
 #include <QPrintDialog>
 #include <QPrinter>
+#include <QQuickWidget>
 
 bool WebView::s_forceContextMenuOnMouseRelease = false;
 
@@ -86,6 +87,9 @@ WebView::WebView(QWidget* parent)
                 return;
             }
             m_rwhvqt->installEventFilter(this);
+            if (QQuickWidget *w = qobject_cast<QQuickWidget*>(m_rwhvqt)) {
+                w->setClearColor(palette().color(QPalette::Window));
+            }
         });
     });
 }

themes/chrome/main.css

@@ -345,3 +345,9 @@ QFrame[js-frame2="true"]
     border-top: 0px;
     background-color: #f3f3f3;
 }
+
+/*WebView*/
+WebView
+{
+    background: white;
+}

themes/linux/main.css

@@ -274,3 +274,9 @@ QFrame[js-frame2="true"]
     border-top: 0px;
     background-color: #f3f3f3;
 }
+
+/*WebView*/
+WebView
+{
+    background: white;
+}

themes/mac/main.css

@@ -349,3 +349,9 @@ QFrame[js-frame2="true"]
     border-top: 0px;
     background-color: #f3f3f3;
 }
+
+/*WebView*/
+WebView
+{
+    background: white;
+}

themes/windows/main.css

@@ -436,3 +436,9 @@ QFrame[js-frame2="true"]
     border-top: 0px;
     background-color: #f3f3f3;
 }
+
+/*WebView*/
+WebView
+{
+    background: white;
+}