added decorhints patch

makes dwm respect motif decor hints

config.h

@@ -62,6 +62,7 @@ static const Rule rules[] = {
 static const float mfact     = 0.55; /* factor of master area size [0.05..0.95] */
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
+static const int decorhints  = 1;    /* 1 means respect decoration hints */
 
 static const Layout layouts[] = {
 	/* symbol     arrange function */

dwm.c

@@ -58,6 +58,13 @@
 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
 
+#define MWM_HINTS_FLAGS_FIELD       0
+#define MWM_HINTS_DECORATIONS_FIELD 2
+#define MWM_HINTS_DECORATIONS       (1 << 1)
+#define MWM_DECOR_ALL               (1 << 0)
+#define MWM_DECOR_BORDER            (1 << 1)
+#define MWM_DECOR_TITLE             (1 << 3)
+
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel, SchemeStatus, SchemeTagsSel, SchemeTagsNorm, SchemeInfoSel, SchemeInfoNorm, SchemeMenu }; /* color schemes */
@@ -227,6 +234,7 @@ static void updatebarpos(Monitor *m);
 static void updatebars(void);
 static void updateclientlist(void);
 static int updategeom(void);
+static void updatemotifhints(Client *c);
 static void updatenumlockmask(void);
 static void updatesizehints(Client *c);
 static void updatestatus(void);
@@ -266,7 +274,7 @@ static void (*handler[LASTEvent]) (XEvent *) = {
 	[PropertyNotify] = propertynotify,
 	[UnmapNotify] = unmapnotify
 };
-static Atom wmatom[WMLast], netatom[NetLast];
+static Atom wmatom[WMLast], netatom[NetLast], motifatom;
 static int running = 1;
 static Cur *cursor[CurLast];
 static Clr **scheme;
@@ -1127,6 +1135,7 @@ manage(Window w, XWindowAttributes *wa)
 	updatewindowtype(c);
 	updatesizehints(c);
 	updatewmhints(c);
+	updatemotifhints(c);
 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 	grabbuttons(c, 0);
 	if (!c->isfloating)
@@ -1313,6 +1322,8 @@ propertynotify(XEvent *e)
 		}
 		if (ev->atom == netatom[NetWMWindowType])
 			updatewindowtype(c);
+		if (ev->atom == motifatom)
+			updatemotifhints(c);
 	}
 }
 
@@ -1641,6 +1652,7 @@ setup(void)
 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
+	motifatom = XInternAtom(dpy, "_MOTIF_WM_HINTS", False);
 	/* init cursors */
 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
@@ -2005,6 +2017,39 @@ updategeom(void)
 	return dirty;
 }
 
+void
+updatemotifhints(Client *c)
+{
+	Atom real;
+	int format;
+	unsigned char *p = NULL;
+	unsigned long n, extra;
+	unsigned long *motif;
+	int width, height;
+
+	if (!decorhints)
+		return;
+
+	if (XGetWindowProperty(dpy, c->win, motifatom, 0L, 5L, False, motifatom,
+	                       &real, &format, &n, &extra, &p) == Success && p != NULL) {
+		motif = (unsigned long*)p;
+		if (motif[MWM_HINTS_FLAGS_FIELD] & MWM_HINTS_DECORATIONS) {
+			width = WIDTH(c);
+			height = HEIGHT(c);
+
+			if (motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_ALL ||
+			    motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_BORDER ||
+			    motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_TITLE)
+				c->bw = c->oldbw = borderpx;
+			else
+				c->bw = c->oldbw = 0;
+
+			resize(c, c->x, c->y, width - (2*c->bw), height - (2*c->bw), 0);
+		}
+		XFree(p);
+	}
+}
+
 void
 updatenumlockmask(void)
 {