X11: Continuous Presentation (#7762)

Alternative to #7758, which doesn't involve adding a new trait method
`request_draw`.
Somehow, my whole screen goes blinking black with this when moving the
window, so not ready for landing.

Release Notes:
- N/A

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

crates/gpui/src/platform/linux/platform.rs

@@ -64,7 +64,9 @@ impl Default for LinuxPlatform {
 
 impl LinuxPlatform {
     pub(crate) fn new() -> Self {
-        let (xcb_connection, x_root_index) = xcb::Connection::connect(None).unwrap();
+        let (xcb_connection, x_root_index) =
+            xcb::Connection::connect_with_extensions(None, &[xcb::Extension::Present], &[])
+                .unwrap();
         let atoms = XcbAtoms::intern_all(&xcb_connection).unwrap();
 
         let xcb_connection = Arc::new(xcb_connection);