Fix wm_size-hints race between KDE/KWin and Gtk+ 3.
* emacsgtkfixed.c: State that this is only used with Gtk+3. (_EmacsFixedPrivate): Remove minwidth/height. Add struct frame *f. (emacs_fixed_init): Initialize priv->f. (get_parent_class, emacs_fixed_set_min_size): Remove. (emacs_fixed_new): Set priv->f to argument. (emacs_fixed_get_preferred_width) (emacs_fixed_get_preferred_height): Use min_width/height from frames size_hint to set minimum and natural. (XSetWMSizeHints, XSetWMNormalHints): Override these functions and use min_width/height from frames size_hint to set min_width/height (Bug#8919). * emacsgtkfixed.h: State that this is only used with Gtk+3. (emacs_fixed_set_min_size): Remove. (emacs_fixed_new): Take frame as argument. * gtkutil.c (xg_create_frame_widgets): Pass f to emacs_fixed_new. (x_wm_set_size_hint): Remove call to emacs_fixed_set_min_size. Fix indentation.
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