Fix double-clicking on non-empty title bar area (#39500)

Closes #38685 



Release Notes:

- N/A

---------

Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

crates/gpui/src/platform/windows/events.rs

@@ -57,7 +57,10 @@ impl WindowsWindowInner {
             WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
             WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
             WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
-            WM_NCLBUTTONDOWN => {
+            // Treat double click as a second single click, since we track the double clicks ourselves.
+            // If you don't interact with any elements, this will fall through to the windows default
+            // behavior of toggling whether the window is maximized.
+            WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
                 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
             }
             WM_NCRBUTTONDOWN => {