Map (WS_EX_TOOLWINDOW & WS_CAPTION) to _NET_WM_WINDOW_TYPE_UTILITY.

dlls/x11drv/window.c

diff --git a/dlls/x11drv/window.c b/dlls/x11drv/window.c
index 446fdf2..f6ed8c7 100644
--- a/dlls/x11drv/window.c
+++ b/dlls/x11drv/window.c
@@ -81,6 +81,8 @@
     "_NET_WM_PID",
     "_NET_WM_PING",
     "_NET_WM_NAME",
+    "_NET_WM_WINDOW_TYPE",
+    "_NET_WM_WINDOW_TYPE_UTILITY",
     "XdndAware",
     "XdndEnter",
     "XdndPosition",
@@ -119,10 +121,11 @@
     if (win->dwExStyle & WS_EX_TRAYWINDOW) return TRUE;
     /* child windows are not managed */
     if (win->dwStyle & WS_CHILD) return FALSE;
-    /* tool windows are not managed */
-    if (win->dwExStyle & WS_EX_TOOLWINDOW) return FALSE;
-    /* windows with caption or thick frame are managed */
+    /* windows with caption are managed */
     if ((win->dwStyle & WS_CAPTION) == WS_CAPTION) return TRUE;
+    /* tool windows are not managed  */
+    if (win->dwExStyle & WS_EX_TOOLWINDOW) return FALSE;
+    /* windows with thick frame are managed */
     if (win->dwStyle & WS_THICKFRAME) return TRUE;
     /* default: not managed */
     return FALSE;
@@ -424,6 +427,14 @@
     XChangeProperty(display, data->whole_window, x11drv_atom(_NET_WM_PID),
                     XA_CARDINAL, 32, PropModeReplace, (char *)&i, 1);
 
+   /* map WS_EX_TOOLWINDOW to _NET_WM_WINDOW_TYPE_UTILITY */
+   if (win->dwExStyle & WS_EX_TOOLWINDOW)
+   {
+      Atom a = x11drv_atom(_NET_WM_WINDOW_TYPE_UTILITY);
+      XChangeProperty(display, data->whole_window, x11drv_atom(_NET_WM_WINDOW_TYPE),
+                      XA_ATOM, 32, PropModeReplace, (char*)&a, 1);
+   }
+
     mwm_hints.flags = MWM_HINTS_FUNCTIONS | MWM_HINTS_DECORATIONS;
     mwm_hints.functions = 0;
     if ((win->dwStyle & WS_CAPTION) == WS_CAPTION) mwm_hints.functions |= MWM_FUNC_MOVE;

dlls/x11drv/x11drv.h

diff --git a/dlls/x11drv/x11drv.h b/dlls/x11drv/x11drv.h
index 6020c69..b09bc49 100644
--- a/dlls/x11drv/x11drv.h
+++ b/dlls/x11drv/x11drv.h
@@ -395,6 +395,8 @@
     XATOM__NET_WM_PID,
     XATOM__NET_WM_PING,
     XATOM__NET_WM_NAME,
+    XATOM__NET_WM_WINDOW_TYPE,
+    XATOM__NET_WM_WINDOW_TYPE_UTILITY,
     XATOM_XdndAware,
     XATOM_XdndEnter,
     XATOM_XdndPosition,