Don't include NUL byte in _NET_WM_NAME (#658)

> The contents of the property are not required to be null-terminated;
> any terminating null should not be included in text_prop.nitems.

https://tronche.com/gui/x/xlib/ICC/client-to-window-manager/XmbTextPropertyToTextList.html

CHANGELOG.md

@@ -1,10 +1,12 @@
 # Unreleased
+
 - On Wayland, windows will use server-side decorations when available.
 - Added support for F16-F24 keys.
 - Fixed graphical glitches when resizing on Wayland.
 - On Windows, fix freezes when performing certain actions after a window resize has been triggered. Reintroduces some visual artifacts when resizing.
 - Updated window manager hints under X11 to v1.5 of [Extended Window Manager Hints](https://specifications.freedesktop.org/wm-spec/wm-spec-1.5.html#idm140200472629520).
 - Added `WindowBuilderExt::with_gtk_theme_variant` to X11-specific `WindowBuilder` functions.
+- Fixed UTF8 handling bug in X11 `set_title` function.
 
 # Version 0.17.2 (2018-08-19)
 

src/platform/linux/x11/window.rs

@@ -600,7 +600,7 @@ impl UnownedWindow {
                 wm_name_atom,
                 utf8_atom,
                 util::PropMode::Replace,
-                title.as_bytes_with_nul(),
+                title.as_bytes(),
             )
         }
     }