SFML 2.5.0 patch against https://github.com/SFML/SFML/blob/2.5.0/src/SFML/Window/Unix/WindowImplX11.cpp for nicer borderless fullscreen windows

sfml_patch.diff

diff --git a/SFML-2.5.0/src/SFML/Window/Unix/WindowImplX11.cpp b/SFML-2.5.0/src/SFML/Window/Unix/WindowImplX11.cpp
index e2c8d29..a4dcd8e 100644
--- a/SFML-2.5.0/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/SFML-2.5.0/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -641,7 +641,10 @@ m_lastInputTime  (0)
                 hints.decorations |= MWM_DECOR_BORDER | MWM_DECOR_TITLE | MWM_DECOR_MINIMIZE | MWM_DECOR_MENU;
                 hints.functions   |= MWM_FUNC_MOVE | MWM_FUNC_MINIMIZE;
             }
-            if (style & Style::Resize)
+
+            //We want to enable resizing before going into fullscreen mode
+            //otherwise some WMs won't resize the window to fill the screen.
+            if (style & Style::Resize || style == 0) //For some reason, the sf::Style::None enum isn't behaving here.
             {
                 hints.decorations |= MWM_DECOR_MAXIMIZE | MWM_DECOR_RESIZEH;
                 hints.functions   |= MWM_FUNC_MAXIMIZE | MWM_FUNC_RESIZE;
@@ -662,19 +665,6 @@ m_lastInputTime  (0)
                             5);
         }
     }
-
-    // This is a hack to force some windows managers to disable resizing
-    if (!(style & Style::Resize))
-    {
-        m_useSizeHints = true;
-        XSizeHints* sizeHints = XAllocSizeHints();
-        sizeHints->flags = PMinSize | PMaxSize;
-        sizeHints->min_width = sizeHints->max_width = width;
-        sizeHints->min_height = sizeHints->max_height = height;
-        XSetWMNormalHints(m_display, m_window, sizeHints);
-        XFree(sizeHints);
-    }
-
     // Set the window's WM class (this can be used by window managers)
     XClassHint* hint = XAllocClassHint();
 
@@ -711,6 +701,26 @@ m_lastInputTime  (0)
         setVideoMode(mode);
         switchToFullscreen();
     }
+
+    //Since we're only using sf::Style::None forborderless fullscreen in The
+    //Away Team, we want to make sure _NET_WM_STATE_FULLSCREEN, etc is set.
+    if ((style == 0)) //For some reason, the sf::Style::None enum isn't behaving here.
+    {
+        switchToFullscreen();
+    }
+    //This is a hack to force some windows managers to disable resizing
+    //and it needs to be done after switching to fullscreen in order for some
+    //WMs to resize the window to cover the entire screen.
+    else if (!(style & Style::Resize))
+    {
+        m_useSizeHints = true;
+        XSizeHints* sizeHints = XAllocSizeHints();
+        sizeHints->flags = PMinSize | PMaxSize;
+        sizeHints->min_width = sizeHints->max_width = width;
+        sizeHints->min_height = sizeHints->max_height = height;
+        XSetWMNormalHints(m_display, m_window, sizeHints);
+        XFree(sizeHints);
+    }
 }