Cocoa color dialog cannot be modal, but should show anyway

Silently failing doesn't seem the right way to handle this.
Updated docs for DontUseNativeDialog option: it's not just for
the Mac anymore.  Ensure that the Qt dialog and Mac panel
will never be shown at the same time.

Change-Id: Ia9e80754df6c7622d9039c8dd050ac4de771a030
Task-number: QTBUG-29161
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
index 514ea0482f..901aa667f5 100644
--- a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
@@ -368,10 +368,8 @@ void QCocoaColorDialogHelper::exec()
 
 bool QCocoaColorDialogHelper::show(Qt::WindowFlags, Qt::WindowModality windowModality, QWindow *parent)
 {
-    if (windowModality == Qt::WindowModal) {
-        // Cocoa's shared color panel cannot be shown as a sheet
-        return false;
-    }
+    if (windowModality == Qt::WindowModal)
+        windowModality = Qt::ApplicationModal;
     return showCocoaColorPanel(windowModality, parent);
 }
 
@@ -434,9 +432,9 @@ bool QCocoaColorDialogHelper::showCocoaColorPanel(Qt::WindowModality windowModal
     createNSColorPanelDelegate();
     QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) *delegate = static_cast<QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) *>(mDelegate);
     [delegate->mColorPanel setShowsAlpha:options()->testOption(QColorDialogOptions::ShowAlphaChannel)];
-    if (windowModality == Qt::NonModal)
+    if (windowModality != Qt::WindowModal)
         [delegate showModelessPanel];
-    // no need to show a Qt::ApplicationModal dialog here, since it will be done in _q_platformRunNativeAppModalPanel()
+    // no need to show a Qt::WindowModal dialog here, because it's necessary to call exec() in that case
     return true;
 }