Use a saner sanity check for floating_reposition.

The function contained_by_output checks whether any output contains any
parts of a give rect. Rather than relying on the central point of the rect.

include/randr.h

@@ -87,6 +87,16 @@ Output *get_output_by_name(const char *name);
  */
 Output *get_output_containing(int x, int y);
 
+/*
+ * In contained_by_output, we check if any active output contains part of the container.
+ * We do this by checking if the output rect is intersected by the Rect.
+ * This is the 2-dimensional counterpart of get_output_containing.
+ * Since we don't actually need the outputs intersected by the given Rect (There could
+ * be many), we just return true or false for convenience.
+ *
+ */
+bool contained_by_output(Rect rect);
+
 /**
  * Gets the output which is the next one in the given direction.
  *

src/floating.c

@@ -659,11 +659,7 @@ void drag_pointer(Con *con, const xcb_button_press_event_t *event, xcb_window_t
 void floating_reposition(Con *con, Rect newrect) {
     /* Sanity check: Are the new coordinates on any output? If not, we
      * ignore that request. */
-    Output *output = get_output_containing(
-        newrect.x + (newrect.width / 2),
-        newrect.y + (newrect.height / 2));
-
-    if (!output) {
+    if (!contained_by_output(newrect)) {
         ELOG("No output found at destination coordinates. Not repositioning.\n");
         return;
     }

src/randr.c

@@ -92,6 +92,31 @@ Output *get_output_containing(int x, int y) {
     return NULL;
 }
 
+/*
+ * In contained_by_output, we check if any active output contains part of the container.
+ * We do this by checking if the output rect is intersected by the Rect.
+ * This is the 2-dimensional counterpart of get_output_containing.
+ * Since we don't actually need the outputs intersected by the given Rect (There could
+ * be many), we just return true or false for convenience.
+ *
+ */
+bool contained_by_output(Rect rect){
+    Output *output;
+    int lx = rect.x, uy = rect.y;
+    int rx = rect.x + rect.width, by = rect.y + rect.height;
+    TAILQ_FOREACH(output, &outputs, outputs) {
+        if (!output->active)
+            continue;
+        DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
+                        rect.x, rect.y, output->rect.x, output->rect.y, output->rect.width, output->rect.height);
+        if (rx >= (int)output->rect.x && lx <= (int)(output->rect.x + output->rect.width) &&
+            by >= (int)output->rect.y && uy <= (int)(output->rect.y + output->rect.height))
+            return true;
+    }
+    return false;
+
+}
+
 /*
  * Like get_output_next with close_far == CLOSEST_OUTPUT, but wraps.
  *