Add WindowBuilder::with_outer_position (#1866)

src/platform_impl/linux/x11/util/hint.rs

@@ -190,6 +190,24 @@ impl<'a> NormalHints<'a> {
         }
     }
 
+    pub fn get_position(&self) -> Option<(i32, i32)> {
+        if has_flag(self.size_hints.flags, ffi::PPosition) {
+            Some((self.size_hints.x as i32, self.size_hints.y as i32))
+        } else {
+            None
+        }
+    }
+
+    pub fn set_position(&mut self, position: Option<(i32, i32)>) {
+        if let Some((x, y)) = position {
+            self.size_hints.flags |= ffi::PPosition;
+            self.size_hints.x = x as c_int;
+            self.size_hints.y = y as c_int;
+        } else {
+            self.size_hints.flags &= !ffi::PPosition;
+        }
+    }
+
     // WARNING: This hint is obsolete
     pub fn set_size(&mut self, size: Option<(u32, u32)>) {
         if let Some((width, height)) = size {

src/platform_impl/linux/x11/util/mod.rs

@@ -23,6 +23,7 @@ pub use self::{
 
 use std::{
     mem::{self, MaybeUninit},
+    ops::BitAnd,
     os::raw::*,
     ptr,
 };
@@ -39,6 +40,13 @@ pub fn maybe_change<T: PartialEq>(field: &mut Option<T>, value: T) -> bool {
     }
 }
 
+pub fn has_flag<T>(bitset: T, flag: T) -> bool
+where
+    T: Copy + PartialEq + BitAnd<T, Output = T>,
+{
+    bitset & flag == flag
+}
+
 #[must_use = "This request was made asynchronously, and is still in the output buffer. You must explicitly choose to either `.flush()` (empty the output buffer, sending the request now) or `.queue()` (wait to send the request, allowing you to continue to add more requests without additional round-trips). For more information, see the documentation for `util::flush_requests`."]
 pub struct Flusher<'a> {
     xconn: &'a XConnection,