screen: concentrate the setting of placewewant

Instead of saving the current value of placewewant, then setting the
new value, and then passing the old value to edit_redraw() in seven
different places, just let edit_redraw() do this saving and setting.

In the bargain placewewant is now only recalculated when it matters
-- when allow_update is TRUE -- and not when it's superfluous.

src/move.c

@@ -146,7 +146,6 @@ void do_page_down(void)
 void do_para_begin(bool allow_update)
 {
     filestruct *current_save = openfile->current;
-    const size_t pww_save = openfile->placewewant;
 
     if (openfile->current != openfile->fileage) {
 	do {
@@ -156,10 +155,9 @@ void do_para_begin(bool allow_update)
     }
 
     openfile->current_x = 0;
-    openfile->placewewant = 0;
 
     if (allow_update)
-	edit_redraw(current_save, pww_save);
+	edit_redraw(current_save);
 }
 
 /* Move up to the beginning of the last beginning-of-paragraph line
@@ -178,7 +176,6 @@ void do_para_begin_void(void)
 void do_para_end(bool allow_update)
 {
     filestruct *const current_save = openfile->current;
-    const size_t pww_save = openfile->placewewant;
 
     while (openfile->current != openfile->filebot &&
 	!inpar(openfile->current))
@@ -194,14 +191,11 @@ void do_para_end(bool allow_update)
     if (openfile->current != openfile->filebot) {
 	openfile->current = openfile->current->next;
 	openfile->current_x = 0;
-	openfile->placewewant = 0;
-    } else {
+    } else
 	openfile->current_x = strlen(openfile->current->data);
-	openfile->placewewant = xplustabs();
-    }
 
     if (allow_update)
-	edit_redraw(current_save, pww_save);
+	edit_redraw(current_save);
 }
 
 /* Move down to the beginning of the last line of the current paragraph.
@@ -219,7 +213,6 @@ void do_para_end_void(void)
  * screen afterwards. */
 void do_prev_word(bool allow_punct, bool allow_update)
 {
-    size_t pww_save = openfile->placewewant;
     filestruct *current_save = openfile->current;
     bool seen_a_word = FALSE, step_forward = FALSE;
 
@@ -256,11 +249,10 @@ void do_prev_word(bool allow_punct, bool allow_update)
 	/* Move one character forward again to sit on the start of the word. */
 	openfile->current_x = move_mbright(openfile->current->data,
 						openfile->current_x);
-    openfile->placewewant = xplustabs();
 
     /* If allow_update is TRUE, update the screen. */
     if (allow_update)
-	edit_redraw(current_save, pww_save);
+	edit_redraw(current_save);
 }
 
 /* Move to the previous word in the file, treating punctuation as part of a
@@ -276,7 +268,6 @@ void do_prev_word_void(void)
  * otherwise. */
 bool do_next_word(bool allow_punct, bool allow_update)
 {
-    size_t pww_save = openfile->placewewant;
     filestruct *current_save = openfile->current;
     bool started_on_word = is_word_mbchar(openfile->current->data +
 				openfile->current_x, allow_punct);
@@ -309,11 +300,9 @@ bool do_next_word(bool allow_punct, bool allow_update)
 	    break;
     }
 
-    openfile->placewewant = xplustabs();
-
     /* If allow_update is TRUE, update the screen. */
     if (allow_update)
-	edit_redraw(current_save, pww_save);
+	edit_redraw(current_save);
 
     /* Return whether we started on a word. */
     return started_on_word;

src/nano.c

@@ -1746,7 +1746,6 @@ int do_mouse(void)
 #ifndef NANO_TINY
 	size_t current_x_save = openfile->current_x;
 #endif
-	size_t pww_save = openfile->placewewant;
 
 	sameline = (mouse_y == openfile->current_y);
 
@@ -1798,8 +1797,6 @@ int do_mouse(void)
 		get_page_start(xplustabs()) + mouse_x);
 	}
 
-	openfile->placewewant = xplustabs();
-
 #ifndef NANO_TINY
 	/* Clicking where the cursor is toggles the mark, as does
 	 * clicking beyond the line length with the cursor at the end of
@@ -1811,7 +1808,7 @@ int do_mouse(void)
 	    /* The cursor moved; clean the cutbuffer on the next cut. */
 	    cutbuffer_reset();
 
-	edit_redraw(current_save, pww_save);
+	edit_redraw(current_save);
     }
 
     /* No more handling is needed. */

src/proto.h

@@ -792,7 +792,7 @@ void edit_draw(filestruct *fileptr, const char *converted, int
 int update_line(filestruct *fileptr, size_t index);
 bool need_screen_update(size_t pww_save);
 void edit_scroll(scroll_dir direction, ssize_t nlines);
-void edit_redraw(filestruct *old_current, size_t pww_save);
+void edit_redraw(filestruct *old_current);
 void edit_refresh(void);
 void edit_update(update_type location);
 void total_redraw(void);

src/search.c

@@ -482,7 +482,6 @@ void go_looking(void)
 {
     filestruct *was_current = openfile->current;
     size_t was_current_x = openfile->current_x;
-    size_t was_pww = openfile->placewewant;
     int didfind;
 
     findnextstr_wrap_reset();
@@ -498,8 +497,7 @@ void go_looking(void)
 		openfile->current_x == was_current_x)
 	statusbar(_("This is the only occurrence"));
 
-    openfile->placewewant = xplustabs();
-    edit_redraw(was_current, was_pww);
+    edit_redraw(was_current);
     search_replace_abort();
 }
 
@@ -1113,9 +1111,7 @@ void do_find_bracket(void)
 	    /* If count is zero, we've found a matching bracket.  Update
 	     * the screen and get out. */
 	    if (count == 0) {
-		size_t pww_save = openfile->placewewant;
-		openfile->placewewant = xplustabs();
-		edit_redraw(current_save, pww_save);
+		edit_redraw(current_save);
 		break;
 	    }
 	} else {

src/text.c

@@ -1950,7 +1950,6 @@ void do_justify(bool full_justify)
     filestruct *edittop_save = openfile->edittop;
     filestruct *current_save = openfile->current;
     size_t current_x_save = openfile->current_x;
-    size_t pww_save = openfile->placewewant;
     size_t totsize_save = openfile->totsize;
 #ifndef NANO_TINY
     filestruct *mark_begin_save = openfile->mark_begin;
@@ -2295,7 +2294,6 @@ void do_justify(bool full_justify)
 	    openfile->edittop = edittop_save;
 	    openfile->current = current_save;
 	    openfile->current_x = current_x_save;
-	    openfile->placewewant = pww_save;
 	    openfile->totsize = totsize_save;
 #ifndef NANO_TINY
 	    if (openfile->mark_set) {
@@ -2316,6 +2314,9 @@ void do_justify(bool full_justify)
 	/* Put the keystroke back into the queue. */
 	unget_kbinput(kbinput, meta_key, func_key);
 
+	/* Set the desired screen column (always zero, except at EOF). */
+	openfile->placewewant = xplustabs();
+
 #ifndef NANO_TINY
 	/* Throw away the entire undo stack, to prevent a crash when
 	 * the user tries to undo something in the justified text. */

src/winio.c

@@ -2958,8 +2958,12 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
 
 /* Update any lines between old_current and current that need to be
  * updated.  Use this if we've moved without changing any text. */
-void edit_redraw(filestruct *old_current, size_t pww_save)
+void edit_redraw(filestruct *old_current)
 {
+    size_t was_pww = openfile->placewewant;
+
+    openfile->placewewant = xplustabs();
+
     /* If the current line is offscreen, scroll until it's onscreen. */
     if (openfile->current->lineno >= openfile->edittop->lineno + maxrows ||
 		openfile->current->lineno < openfile->edittop->lineno)
@@ -2980,7 +2984,7 @@ void edit_redraw(filestruct *old_current, size_t pww_save)
 #endif /* !NANO_TINY */
 
     /* Update old_current and current if we've changed page. */
-    if (need_screen_update(0) || need_screen_update(pww_save)) {
+    if (need_screen_update(0) || need_screen_update(was_pww)) {
 	update_line(old_current, 0);
 	update_line(openfile->current, openfile->current_x);
     }