m: Update to x11rb 0.13.0

The only breaking change is that x11rb no longer reports an error when
querying the WmSizeHints of a window that does not have this property
set. For this reason, the return type of WmSizeHintsCookie::Reply()
changed from Result<WmSizeHints, SomeError> to
Result<Option<WmSizeHints>, SomeError>.

In update_normal_hints(), previously a cryptic error would be reported
to the caller. Instead, this now uses unwrap_or_default() to get a
WmSizeHints. All fields of WmSizeHints are Options, so this produces an
empty object.

resize_increments() queries a value from the window and returns an
Option. Previously, the error for "missing property" was turned into
None via .ok(). This commit adds a call to flatten() to also turn
"property not set" into None.

Finally, request_user_attention() queries a window's WmHints property
and updates one field of it. The code already uses unwrap_or_default()
to deal with missing properties, so just a call to flatten() is needed
to merge "missing property" and "error while querying" into one.

Other changes in x11rb do not seem to affect this crate.

x11rb's MSRV increased from 1.56 to 1.63, which is still below the MSRV
of this crate, which is 1.65.

Signed-off-by: Uli Schlachter <psychon@znc.in>

Cargo.toml

@@ -166,7 +166,7 @@ wayland-client = { version = "0.31.1", optional = true }
 wayland-protocols = { version = "0.31.0", features = [ "staging"], optional = true }
 wayland-protocols-plasma = { version = "0.2.0", features = [ "client" ], optional = true }
 x11-dl = { version = "2.18.5", optional = true }
-x11rb = { version = "0.12.0", default-features = false, features = ["allow-unsafe-code", "dl-libxcb", "randr", "resource_manager", "xinput", "xkb"], optional = true }
+x11rb = { version = "0.13.0", default-features = false, features = ["allow-unsafe-code", "dl-libxcb", "randr", "resource_manager", "xinput", "xkb"], optional = true }
 xkbcommon-dl = "0.4.0"
 
 [target.'cfg(target_os = "redox")'.dependencies]

src/platform_impl/linux/x11/window.rs

@@ -1377,7 +1377,8 @@ impl UnownedWindow {
             self.xwindow as xproto::Window,
             xproto::AtomEnum::WM_NORMAL_HINTS,
         )?
-        .reply()?;
+        .reply()?
+        .unwrap_or_default();
         callback(&mut normal_hints);
         normal_hints
             .set(
@@ -1430,6 +1431,7 @@ impl UnownedWindow {
         )
         .ok()
         .and_then(|cookie| cookie.reply().ok())
+        .flatten()
         .and_then(|hints| hints.size_increment)
         .map(|(width, height)| (width as u32, height as u32).into())
     }
@@ -1824,6 +1826,7 @@ impl UnownedWindow {
             WmHints::get(self.xconn.xcb_connection(), self.xwindow as xproto::Window)
                 .ok()
                 .and_then(|cookie| cookie.reply().ok())
+                .flatten()
                 .unwrap_or_default();
 
         wm_hints.urgent = request_type.is_some();