Implement support for size hints (including test case)

include/all.h

@@ -22,6 +22,7 @@
 #include <errno.h>
 #include <err.h>
 #include <stdint.h>
+#include <math.h>
 
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>

include/data.h

@@ -283,6 +283,19 @@ struct Con {
 
     double percent;
 
+    /* proportional width/height, calculated from WM_NORMAL_HINTS, used to
+     * apply an aspect ratio to windows (think of MPlayer) */
+    int proportional_width;
+    int proportional_height;
+    /* the wanted size of the window, used in combination with size
+     * increments (see below). */
+    int base_width;
+    int base_height;
+
+    /* minimum increment size specified for the window (in pixels) */
+    int width_increment;
+    int height_increment;
+
     struct Window *window;
 
     /* Should this container be marked urgent? This gets set when the window

include/handlers.h

@@ -158,6 +158,7 @@ int handle_client_message(void *data, xcb_connection_t *conn,
 int handle_window_type(void *data, xcb_connection_t *conn, uint8_t state,
                        xcb_window_t window, xcb_atom_t atom,
                        xcb_get_property_reply_t *property);
+#endif
 
 /**
  * Handles the size hints set by a window, but currently only the part
@@ -171,7 +172,6 @@ int handle_normal_hints(void *data, xcb_connection_t *conn, uint8_t state,
                         xcb_window_t window, xcb_atom_t name,
                         xcb_get_property_reply_t *reply);
 
-#endif
 /**
  * Handles the WM_HINTS property for extracting the urgency state of the window.
  *