patch 8.1.2057: the screen.c file is much too big

Problem:    The screen.c file is much too big.
Solution:   Split it in three parts. (Yegappan Lakshmanan, closes #4943)

Filelist

@@ -32,6 +32,8 @@ SRC_ALL =	\
 		src/dict.c \
 		src/diff.c \
 		src/digraph.c \
+		src/drawline.c \
+		src/drawscreen.c \
 		src/edit.c \
 		src/eval.c \
 		src/evalbuffer.c \
@@ -192,6 +194,8 @@ SRC_ALL =	\
 		src/proto/dict.pro \
 		src/proto/diff.pro \
 		src/proto/digraph.pro \
+		src/proto/drawline.pro \
+		src/proto/drawscreen.pro \
 		src/proto/edit.pro \
 		src/proto/eval.pro \
 		src/proto/evalbuffer.pro \

src/Make_cyg_ming.mak

@@ -719,6 +719,8 @@ OBJ = \
 	$(OUTDIR)/dict.o \
 	$(OUTDIR)/diff.o \
 	$(OUTDIR)/digraph.o \
+	$(OUTDIR)/drawline.o \
+	$(OUTDIR)/drawscreen.o \
 	$(OUTDIR)/edit.o \
 	$(OUTDIR)/eval.o \
 	$(OUTDIR)/evalbuffer.o \

src/Make_morph.mak

@@ -39,6 +39,8 @@ SRC =	arabic.c						\
 	dict.c							\
 	diff.c							\
 	digraph.c						\
+	drawline.c						\
+	drawscreen.c						\
 	edit.c							\
 	eval.c							\
 	evalbuffer.c						\

src/Make_mvc.mak

@@ -726,6 +726,8 @@ OBJ = \
 	$(OUTDIR)\dict.obj \
 	$(OUTDIR)\diff.obj \
 	$(OUTDIR)\digraph.obj \
+	$(OUTDIR)\drawline.obj \
+	$(OUTDIR)\drawscreen.obj \
 	$(OUTDIR)\edit.obj \
 	$(OUTDIR)\eval.obj \
 	$(OUTDIR)\evalbuffer.obj \
@@ -1484,6 +1486,10 @@ $(OUTDIR)/xpatience.obj:	$(OUTDIR) xdiff/xpatience.c  $(XDIFF_DEPS)
 
 $(OUTDIR)/digraph.obj:	$(OUTDIR) digraph.c  $(INCL)
 
+$(OUTDIR)/drawline.obj:	$(OUTDIR) drawline.c  $(INCL)
+
+$(OUTDIR)/drawscreen.obj:	$(OUTDIR) drawscreen.c  $(INCL)
+
 $(OUTDIR)/edit.obj:	$(OUTDIR) edit.c  $(INCL)
 
 $(OUTDIR)/eval.obj:	$(OUTDIR) eval.c  $(INCL)
@@ -1783,6 +1789,8 @@ proto.h: \
 	proto/dict.pro \
 	proto/diff.pro \
 	proto/digraph.pro \
+	proto/drawline.pro \
+	proto/drawscreen.pro \
 	proto/edit.pro \
 	proto/eval.pro \
 	proto/evalbuffer.pro \

src/Make_vms.mms

@@ -309,8 +309,8 @@ ALL_LIBS = $(LIBS) $(GUI_LIB_DIR) $(GUI_LIB) \
 
 SRC =	arabic.c arglist.c autocmd.c beval.c blob.c blowfish.c buffer.c \
 	change.c charset.c cmdexpand.c cmdhist.c crypt.c crypt_zip.c \
-	debugger.c dict.c diff.c digraph.c edit.c eval.c evalbuffer.c \
+	debugger.c dict.c diff.c digraph.c drawline.c drawscreen.c edit.c \
-	evalfunc.c \
+	eval.c evalbuffer.c evalfunc.c \
 	evalvars.c evalwindow.c ex_cmds.c ex_cmds2.c ex_docmd.c ex_eval.c \
 	ex_getln.c \
 	if_cscope.c if_xcmdsrv.c fileio.c filepath.c, findfile.c fold.c \
@@ -329,8 +329,8 @@ SRC =	arabic.c arglist.c autocmd.c beval.c blob.c blowfish.c buffer.c \
 OBJ = 	arabic.obj arglist.obj autocmd.obj beval.obj blob.obj blowfish.obj \
 	buffer.obj change.obj charset.obj cmdexpand.obj cmdhist.obj \
 	crypt.obj crypt_zip.obj debugger.obj dict.obj diff.obj digraph.obj \
-	edit.obj eval.obj evalbuffer.obj evalfunc.obj evalvars.obj \
+	drawline.obj drawscreen.obj edit.obj eval.obj evalbuffer.obj \
-	evalwindow.obj ex_cmds.obj ex_cmds2.obj \
+	evalfunc.obj evalvars.obj evalwindow.obj ex_cmds.obj ex_cmds2.obj \
 	ex_docmd.obj ex_eval.obj ex_getln.obj if_cscope.obj if_xcmdsrv.obj \
 	fileio.obj filepath.obj \
 	findfile.obj fold.obj getchar.obj hardcopy.obj hashtab.obj \
@@ -556,16 +556,22 @@ dict.obj : dict.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h
 diff.obj : diff.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 digraph.obj : digraph.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
  globals.h
+drawline.obj : drawline.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h term.h macros.h structs.h regexp.h \
+ gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
+ globals.h
+drawscreen.obj : drawscreen.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h term.h macros.h structs.h regexp.h \
+ gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
+ globals.h
 edit.obj : edit.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 eval.obj : eval.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
  [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
@@ -620,8 +626,7 @@ findfile.obj : findfile.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h
 fold.obj : fold.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 getchar.obj : getchar.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
@@ -669,8 +674,7 @@ map.obj : map.c vim.h [.auto]config.h feature.h os_unix.h   \
  [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
 mark.obj : mark.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 memfile.obj : memfile.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
@@ -681,8 +685,7 @@ memline.obj : memline.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h
 menu.obj : menu.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 message.obj : message.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
@@ -693,24 +696,20 @@ misc1.obj : misc1.c vim.h [.auto]config.h feature.h os_unix.h   \
  version.h
 misc2.obj : misc2.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 move.obj : move.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 mbyte.obj : mbyte.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 normal.obj : normal.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
  globals.h
 ops.obj : ops.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 option.obj : option.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
@@ -789,42 +788,33 @@ syntax.obj : syntax.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h
 tag.obj : tag.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 term.obj : term.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 termlib.obj : termlib.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 testing.obj : testing.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 textprop.obj : textprop.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 ui.obj : ui.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 undo.obj : undo.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 usercmd.obj : usercmd.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h option.h structs.h \
  regexp.h gui.h beval.h [.proto]gui_beval.pro alloc.h ex_cmds.h spell.h \
  proto.h globals.h
-
 userfunc.obj : userfunc.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h option.h structs.h \
  regexp.h gui.h beval.h [.proto]gui_beval.pro alloc.h ex_cmds.h spell.h \
  proto.h globals.h
-
 version.obj : version.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \
@@ -839,8 +829,7 @@ window.obj : window.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h
 gui.obj : gui.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 gui_gtk.obj : gui_gtk.c gui_gtk_f.h vim.h [.auto]config.h feature.h \
  os_unix.h   ascii.h keymap.h term.h macros.h structs.h \
  regexp.h gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h \
@@ -893,8 +882,7 @@ gui_at_fs.obj : gui_at_fs.c vim.h [.auto]config.h feature.h os_unix.h \
  globals.h gui_at_sb.h
 pty.obj : pty.c vim.h [.auto]config.h feature.h os_unix.h   \
  ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
- [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h globals.h
-
 hangulin.obj : hangulin.c vim.h [.auto]config.h feature.h os_unix.h \
  ascii.h keymap.h term.h macros.h structs.h regexp.h \
  gui.h beval.h [.proto]gui_beval.pro option.h ex_cmds.h proto.h \

src/Makefile

@@ -1593,6 +1593,8 @@ BASIC_SRC = \
 	dict.c \
 	diff.c \
 	digraph.c \
+	drawline.c \
+	drawscreen.c \
 	edit.c \
 	eval.c \
 	evalbuffer.c \
@@ -1727,6 +1729,8 @@ OBJ_COMMON = \
 	objects/dict.o \
 	objects/diff.o \
 	objects/digraph.o \
+	objects/drawline.o \
+	objects/drawscreen.o \
 	objects/edit.o \
 	objects/eval.o \
 	objects/evalbuffer.o \
@@ -1874,6 +1878,8 @@ PRO_AUTO = \
 	dict.pro \
 	diff.pro \
 	digraph.pro \
+	drawline.pro \
+	drawscreen.pro \
 	edit.pro \
 	eval.pro \
 	evalbuffer.pro \
@@ -3083,6 +3089,12 @@ objects/diff.o: diff.c $(XDIFF_INCL)
 objects/digraph.o: digraph.c
 	$(CCC) -o $@ digraph.c
 
+objects/drawline.o: drawline.c
+	$(CCC) -o $@ drawline.c
+
+objects/drawscreen.o: drawscreen.c
+	$(CCC) -o $@ drawscreen.c
+
 objects/edit.o: edit.c
 	$(CCC) -o $@ edit.c
 
@@ -3613,6 +3625,14 @@ objects/digraph.o: digraph.c vim.h protodef.h auto/config.h feature.h os_unix.h
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
  proto.h globals.h
+objects/drawline.o: drawline.c vim.h protodef.h auto/config.h feature.h os_unix.h \
+ auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
+ proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
+ proto.h globals.h
+objects/drawscreen.o: drawscreen.c vim.h protodef.h auto/config.h feature.h os_unix.h \
+ auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
+ proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \
+ proto.h globals.h
 objects/edit.o: edit.c vim.h protodef.h auto/config.h feature.h os_unix.h \
  auto/osdef.h ascii.h keymap.h term.h macros.h option.h beval.h \
  proto/gui_beval.pro structs.h regexp.h gui.h alloc.h ex_cmds.h spell.h \

src/README.md

@@ -32,6 +32,8 @@ cmdexpand.c	| command-line completion
 cmdhist.c	| command-line history
 debugger.c	| vim script debugger
 diff.c		| diff mode (vimdiff)
+drawline.c	| drawing a window line
+drawscreen.c	| drawing the windows
 eval.c		| expression evaluation
 evalbuffer.c	| buffer related built-in functions
 evalfunc.c	| built-in functions

src/globals.h

@@ -61,6 +61,31 @@ EXTERN int	Screen_mco INIT(= 0);		// value of p_mco used when
 // These are single-width.
 EXTERN schar_T	*ScreenLines2 INIT(= NULL);
 
+/*
+ * Buffer for one screen line (characters and attributes).
+ */
+EXTERN schar_T	*current_ScreenLine INIT(= NULL);
+
+/*
+ * Last known cursor position.
+ * Positioning the cursor is reduced by remembering the last position.
+ * Mostly used by windgoto() and screen_char().
+ */
+EXTERN int	screen_cur_row INIT(= 0);
+EXTERN int	screen_cur_col INIT(= 0);
+
+#ifdef FEAT_SEARCH_EXTRA
+EXTERN match_T	screen_search_hl; // used for 'hlsearch' highlight matching
+#endif
+
+#ifdef FEAT_FOLDING
+EXTERN foldinfo_T win_foldinfo;	// info for 'foldcolumn'
+#endif
+
+// Flag that is set when drawing for a callback, not from the main command
+// loop.
+EXTERN int redrawing_for_callback INIT(= 0);
+
 /*
  * Indexes for tab page line:
  *	N > 0 for label of tab page N

src/proto.h

@@ -73,6 +73,8 @@ extern int _stricoll(char *a, char *b);
 # include "dict.pro"
 # include "diff.pro"
 # include "digraph.pro"
+# include "drawline.pro"
+# include "drawscreen.pro"
 # include "edit.pro"
 # include "eval.pro"
 # include "evalbuffer.pro"

src/proto/drawline.pro

@@ -0,0 +1,3 @@
+/* drawline.c */
+int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow, int nochange, int number_only);
+/* vim: set ft=c : */

src/proto/drawscreen.pro

@@ -0,0 +1,25 @@
+/* drawscreen.c */
+int update_screen(int type_arg);
+void win_redr_status(win_T *wp, int ignore_pum);
+void showruler(int always);
+void win_redr_ruler(win_T *wp, int always, int ignore_pum);
+void after_updating_screen(int may_resize_shell);
+void update_curbuf(int type);
+void update_debug_sign(buf_T *buf, linenr_T lnum);
+void updateWindow(win_T *wp);
+int redraw_asap(int type);
+void redraw_after_callback(int call_update_screen);
+void redraw_later(int type);
+void redraw_win_later(win_T *wp, int type);
+void redraw_later_clear(void);
+void redraw_all_later(int type);
+void redraw_curbuf_later(int type);
+void redraw_buf_later(buf_T *buf, int type);
+void redraw_buf_line_later(buf_T *buf, linenr_T lnum);
+void redraw_buf_and_status_later(buf_T *buf, int type);
+void status_redraw_all(void);
+void status_redraw_curbuf(void);
+void redraw_statuslines(void);
+void win_redraw_last_status(frame_T *frp);
+void redrawWinline(win_T *wp, linenr_T lnum);
+/* vim: set ft=c : */

src/proto/screen.pro

@@ -1,40 +1,30 @@
 /* screen.c */
-void redraw_later(int type);
-void redraw_win_later(win_T *wp, int type);
-void redraw_later_clear(void);
-void redraw_all_later(int type);
-void redraw_curbuf_later(int type);
-void redraw_buf_later(buf_T *buf, int type);
-void redraw_buf_line_later(buf_T *buf, linenr_T lnum);
-void redraw_buf_and_status_later(buf_T *buf, int type);
-int redraw_asap(int type);
-void redraw_after_callback(int call_update_screen);
-void redrawWinline(win_T *wp, linenr_T lnum);
-void after_updating_screen(int may_resize_shell);
-void update_curbuf(int type);
-int update_screen(int type_arg);
 int conceal_cursor_line(win_T *wp);
 void conceal_check_cursor_line(void);
-void update_debug_sign(buf_T *buf, linenr_T lnum);
 int get_wcr_attr(win_T *wp);
-void updateWindow(win_T *wp);
+void win_draw_end(win_T *wp, int c1, int c2, int draw_margin, int row, int endrow, hlf_T hl);
+int compute_foldcolumn(win_T *wp, int col);
+void fill_foldcolumn(char_u *p, win_T *wp, int closed, linenr_T lnum);
 int screen_get_current_line_off(void);
+void reset_screen_attr(void);
 void screen_line(int row, int coloff, int endcol, int clear_width, int flags);
 void rl_mirror(char_u *str);
-void status_redraw_all(void);
+void draw_vsep_win(win_T *wp, int row);
-void status_redraw_curbuf(void);
-void redraw_statuslines(void);
-void win_redraw_last_status(frame_T *frp);
 void win_redr_status_matches(expand_T *xp, int num_matches, char_u **matches, int match, int showtail);
 int stl_connected(win_T *wp);
 int get_keymap_str(win_T *wp, char_u *fmt, char_u *buf, int len);
+void win_redr_custom(win_T *wp, int draw_ruler);
 void screen_putchar(int c, int row, int col, int attr);
 void screen_getbytes(int row, int col, char_u *bytes, int *attrp);
 void screen_puts(char_u *text, int row, int col, int attr);
 void screen_puts_len(char_u *text, int textlen, int row, int col, int attr);
+void start_search_hl(void);
+void end_search_hl(void);
 void screen_stop_highlight(void);
 void reset_cterm_colors(void);
+void screen_char(unsigned off, int row, int col);
 void screen_draw_rectangle(int row, int col, int height, int width, int invert);
+void space_to_screenline(int off, int attr);
 void screen_fill(int start_row, int end_row, int start_col, int end_col, int c1, int c2, int attr);
 void check_for_delay(int check_msg_scroll);
 int screen_valid(int doclear);
@@ -56,9 +46,10 @@ void unshowmode(int force);
 void clearmode(void);
 void draw_tabline(void);
 void get_trans_bufname(buf_T *buf);
+int fillchar_status(int *attr, win_T *wp);
+int fillchar_vsep(int *attr);
 int redrawing(void);
 int messaging(void);
-void showruler(int always);
 void comp_col(void);
 int number_width(win_T *wp);
 int screen_screencol(void);

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2057,
 /**/
     2056,
 /**/

src/vim.h

@@ -587,6 +587,13 @@ extern int (*dyn_libintl_wputenv)(const wchar_t *envstring);
 #define NOT_VALID		40  // buffer needs complete redraw
 #define CLEAR			50  // screen messed up, clear it
 
+// flags for screen_line()
+#define SLF_RIGHTLEFT	1
+#define SLF_POPUP	2
+
+#define MB_FILLER_CHAR '<'  // character used when a double-width character
+			    // doesn't fit.
+
 /*
  * Flags for w_valid.
  * These are set when something in a window structure becomes invalid, except