Testing macOS fixes

src/slic3r/GUI/GUI_UtilsMac.mm

@@ -1,5 +1,6 @@
 #include <unistd.h>
 #include <sys/sysctl.h>
+#import <Cocoa/Cocoa.h>
 #import <wx/osx/cocoa/dataview.h>
 #import "GUI_Utils.hpp"
 
@@ -21,6 +22,22 @@ void staticbox_remove_margin(wxStaticBox* sb) {
     [nativeBox setBorderWidth:0];
 }
 
+// wxOSX SetShape only clears the window background; it cannot clip to a region. Clipping the
+// window's view layer to a rounded rect is what actually rounds the opaque webview inside.
+void set_window_corner_radius(wxWindow* win, int radius) {
+    if (!win)
+        return;
+    NSView* view = (NSView*)win->GetHandle();
+    if (!view)
+        return;
+    NSWindow* window = [view window];
+    [window setOpaque:NO];
+    [window setBackgroundColor:[NSColor clearColor]];
+    [view setWantsLayer:YES];
+    [[view layer] setCornerRadius:radius];
+    [[view layer] setMasksToBounds:YES];
+}
+
 bool is_debugger_present()
 // Returns true if the current process is being debugged (either
 // running under the debugger or has a debugger attached post facto).