Make sure sticky windows pop to the front if they get sticky while not being on a visible workspace.

This commit also reworks the way focusing sticky windows is prevented by not focusing them temporarily at all, but preventing the focus in the first place.

include/output.h

@@ -21,3 +21,10 @@ Con *output_get_content(Con *output);
  *
  */
 Output *get_output_from_string(Output *current_output, const char *output_str);
+
+/**
+ * Iterates over all outputs and pushes sticky windows to the currently visible
+ * workspace on that output.
+ *
+ */
+void output_push_sticky_windows(void);