include: Break out view.h from labwc.h

IMHO it encourages better design (by making dependencies more obvious)
to have source file/header file pairs like view.c/view.h, rather than a
monolithic header like labwc.h with everything in it.

I don't think we need to break up all of labwc.h at once, but maybe we
can start pulling it apart bit by bit as it's convenient.

Also:

- Move "struct border" to ssd.h so that view.h can use it without pulling
  in all of labwc.h.
- Add a missing required #include within scaled_font_buffer.h (forward
  declaration of "struct font" is not enough).

src/action.c

@@ -14,6 +14,7 @@
 #include "menu/menu.h"
 #include "private/action.h"
 #include "ssd.h"
+#include "view.h"
 #include "workspaces.h"
 
 enum action_type {

src/cursor.c

@@ -14,6 +14,7 @@
 #include "menu/menu.h"
 #include "resistance.h"
 #include "ssd.h"
+#include "view.h"
 
 static const char * const *cursor_names = NULL;
 

src/debug.c

@@ -1,10 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <wlr/types/wlr_layer_shell_v1.h>
 #include <wlr/types/wlr_scene.h>
-#include "buffer.h"
+#include "common/scene-helpers.h"
 #include "labwc.h"
 #include "node.h"
-#include "common/scene-helpers.h"
+#include "view.h"
 
 #define HEADER_CHARS "------------------------------"
 

src/desktop.c

@@ -5,9 +5,9 @@
 #include "common/scene-helpers.h"
 #include "dnd.h"
 #include "labwc.h"
-#include "layers.h"
 #include "node.h"
 #include "ssd.h"
+#include "view.h"
 #include "workspaces.h"
 
 static void

src/foreign.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include "labwc.h"
+#include "view.h"
 #include "workspaces.h"
 
 static void

src/interactive.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include "labwc.h"
+#include "view.h"
 
 static int
 max_move_scale(double pos_cursor, double pos_current,

src/osd.c

@@ -14,6 +14,7 @@
 #include "labwc.h"
 #include "theme.h"
 #include "node.h"
+#include "view.h"
 #include "workspaces.h"
 
 #define OSD_ITEM_HEIGHT (20)

src/output.c

@@ -19,6 +19,7 @@
 #include "labwc.h"
 #include "layers.h"
 #include "node.h"
+#include "view.h"
 
 static void
 output_frame_notify(struct wl_listener *listener, void *data)

src/resistance.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
-#include "labwc.h"
 #include "config/rcxml.h"
+#include "labwc.h"
+#include "view.h"
 
 struct edges {
 	int left;

src/server.c

@@ -18,6 +18,7 @@
 #include "menu/menu.h"
 #include "ssd.h"
 #include "theme.h"
+#include "view.h"
 #include "workspaces.h"
 
 #define LAB_XDG_SHELL_VERSION (2)

src/ssd/ssd.c

@@ -7,12 +7,11 @@
  */
 
 #include <assert.h>
-#include "config/rcxml.h"
-#include "common/font.h"
-#include "labwc.h"
-#include "theme.h"
-#include "ssd.h"
 #include "common/scene-helpers.h"
+#include "labwc.h"
+#include "ssd.h"
+#include "theme.h"
+#include "view.h"
 
 struct border
 ssd_thickness(struct view *view)

src/ssd/ssd_border.c

@@ -1,9 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include "common/scene-helpers.h"
 #include "labwc.h"
 #include "ssd.h"
 #include "theme.h"
-#include "common/scene-helpers.h"
+#include "view.h"
 
 #define FOR_EACH_STATE(view, tmp) FOR_EACH(tmp, \
 	&(view)->ssd.border.active, \

src/ssd/ssd_extents.c

@@ -1,10 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include "common/mem.h"
+#include "common/scene-helpers.h"
 #include "labwc.h"
 #include "ssd.h"
 #include "theme.h"
-#include "common/mem.h"
-#include "common/scene-helpers.h"
+#include "view.h"
 
 static struct ssd_part *
 add_extent(struct wl_list *part_list, enum ssd_part_type type,

src/ssd/ssd_titlebar.c

@@ -3,14 +3,14 @@
 #define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <string.h>
-#include "labwc.h"
-#include "ssd.h"
-#include "theme.h"
-#include "common/font.h"
 #include "common/mem.h"
 #include "common/scaled_font_buffer.h"
 #include "common/scene-helpers.h"
+#include "labwc.h"
 #include "node.h"
+#include "ssd.h"
+#include "theme.h"
+#include "view.h"
 
 #define FOR_EACH_STATE(view, tmp) FOR_EACH(tmp, \
 	&(view)->ssd.titlebar.active, \

src/view-impl.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <strings.h>
 #include "labwc.h"
+#include "view.h"
 
 void
 view_impl_map(struct view *view)

src/view.c

@@ -7,6 +7,7 @@
 #include "labwc.h"
 #include "ssd.h"
 #include "menu/menu.h"
+#include "view.h"
 #include "workspaces.h"
 
 #define LAB_FALLBACK_WIDTH 640

src/workspaces.c

@@ -12,6 +12,7 @@
 #include "common/list.h"
 #include "common/mem.h"
 #include "labwc.h"
+#include "view.h"
 #include "workspaces.h"
 
 /* Internal helpers */

src/xdg-deco.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include "common/mem.h"
 #include "labwc.h"
+#include "view.h"
 
 struct xdg_deco {
 	struct wlr_xdg_toplevel_decoration_v1 *wlr_decoration;

src/xdg-popup.c

@@ -10,6 +10,7 @@
 #include "common/mem.h"
 #include "labwc.h"
 #include "node.h"
+#include "view.h"
 
 struct xdg_popup {
 	struct view *parent_view;

src/xdg.c

@@ -4,6 +4,7 @@
 #include "labwc.h"
 #include "node.h"
 #include "ssd.h"
+#include "view.h"
 #include "workspaces.h"
 
 static void

src/xwayland.c

@@ -4,6 +4,7 @@
 #include "labwc.h"
 #include "node.h"
 #include "ssd.h"
+#include "view.h"
 #include "workspaces.h"
 
 static void