osx: Make modelss dialogs stay on top of the main window as they're floating panels, not documents

Originally committed to SVN as r6889.

aegisub/src/dialog_manager.h

@@ -25,6 +25,8 @@
 #include <wx/dialog.h>
 #endif
 
+#include "utils.h"
+
 /// @brief A manager for dialogs
 ///
 /// DialogManager keeps track of modal and modeless dialogs which have been
@@ -74,6 +76,7 @@ public:
 				created_dialogs[&typeid(DialogType)] = d;
 				d->Bind(wxEVT_CLOSE_WINDOW, &DialogManager::OnClose, this);
 				d->Show();
+				SetFloatOnParent(d);
 			}
 			catch (agi::UserCancelException const&) { }
 		}

aegisub/src/osx_utils.mm

@@ -36,3 +36,7 @@ void AddFullScreenButton(wxWindow *window) {
 	collectionBehavior |= NSWindowCollectionBehaviorFullScreenPrimary;
 	[nsWindow setCollectionBehavior:collectionBehavior];
 }
+
+void SetFloatOnParent(wxWindow *window) {
+	[[window->GetHandle() window] setLevel:NSFloatingWindowLevel];
+}

aegisub/src/utils.cpp

@@ -424,6 +424,6 @@ void CleanCache(wxString const& directory, wxString const& file_type, int64_t ma
 
 // OS X implementation in osx_utils.mm
 #ifndef __WXOSX_COCOA__
-void AddFullScreenButton(wxWindow *window) {
-}
+void AddFullScreenButton(wxWindow *) { }
+void SetFloatOnParent(wxWindow *) { }
 #endif

aegisub/src/utils.h

@@ -97,6 +97,8 @@ void RestartAegisub();
 /// Add the OS X 10.7+ full-screen button to a window
 void AddFullScreenButton(wxWindow *window);
 
+void SetFloatOnParent(wxWindow *window);
+
 /// Forward a mouse wheel event to the window under the mouse if needed
 /// @param source The initial target of the wheel event
 /// @param evt The event