devdraw: notify window resize promptly on x11

Fixes #339.

src/cmd/devdraw/devdraw.c

@@ -55,10 +55,7 @@ gfx_replacescreenimage(Client *c, Memimage *m)
 		_freememimage(om);
 	}
 	qunlock(&c->drawlk);
-
+	gfx_mouseresized(c);
-	qlock(&c->eventlk);
-	c->mouse.resized = 1;
-	qunlock(&c->eventlk);
 }
 
 static void

src/cmd/devdraw/devdraw.h

@@ -187,6 +187,7 @@ void	gfx_keystroke(Client*, int);
 void	gfx_main(void);
 void	gfx_mousetrack(Client*, int, int, int, uint);
 void	gfx_replacescreenimage(Client*, Memimage*);
+void	gfx_mouseresized(Client*);
 void	gfx_started(void);
 
 // rpc_* routines are called on the RPC thread,

src/cmd/devdraw/mac-screen.m

@@ -518,7 +518,6 @@ rpc_resizeimg(Client *c)
 - (void)resizeimg {
 	[self initimg];
 	gfx_replacescreenimage(self.client, self.img);
-	[self sendmouse:0];
 }
 
 - (void)windowDidResize:(NSNotification *)notification {

src/cmd/devdraw/srv.c

@@ -394,12 +394,30 @@ matchmouse(Client *c)
 	}
 }
 
+void
+gfx_mouseresized(Client *c)
+{
+	gfx_mousetrack(c, -1, -1, -1, -1);
+}
+
 void
 gfx_mousetrack(Client *c, int x, int y, int b, uint ms)
 {
 	Mouse *m;
 
 	qlock(&c->eventlk);
+	if(x == -1 && y == -1 && b == -1 && ms == -1) {
+		Mouse *copy;
+		// repeat last mouse event for resize
+		if(c->mouse.ri == 0)
+			copy = &c->mouse.m[nelem(c->mouse.m)-1];
+		else
+			copy = &c->mouse.m[c->mouse.ri-1];
+		x = copy->xy.x;
+		y = copy->xy.y;
+		b = copy->buttons;
+		ms = copy->msec;
+	}
 	if(x < c->mouserect.min.x)
 		x = c->mouserect.min.x;
 	if(x > c->mouserect.max.x)