vim-patch:8.0.1118: FEAT_WINDOWS adds a lot of #ifdefs

Problem:    FEAT_WINDOWS adds a lot of #ifdefs while it is nearly always
            enabled and only adds 7% to the binary size of the tiny build.
Solution:   Graduate FEAT_WINDOWS.
4033c55eca

src/nvim/buffer.c

@@ -443,6 +443,7 @@ bool close_buffer(win_T *win, buf_T *buf, int action, bool abort_if_last, bool i
     return false;
   }
 
+  // check no autocommands closed the window
   if (win != NULL  // Avoid bogus clang warning.
       && win_valid_any_tab(win)) {
     // Set b_last_cursor when closing the last window for the buffer.

src/nvim/ex_cmds.c

@@ -4862,8 +4862,7 @@ void ex_help(exarg_T *eap)
    * Re-use an existing help window or open a new one.
    * Always open a new one for ":tab help".
    */
-  if (!bt_help(curwin->w_buffer)
+  if (!bt_help(curwin->w_buffer) || cmdmod.cmod_tab != 0) {
-      || cmdmod.cmod_tab != 0) {
     if (cmdmod.cmod_tab != 0) {
       wp = NULL;
     } else {

src/nvim/ex_cmds2.c

@@ -1018,8 +1018,7 @@ void check_arg_idx(win_T *win)
     // We are editing the current entry in the argument list.
     // Set "arg_had_last" if it's also the last one
     win->w_arg_idx_invalid = false;
-    if (win->w_arg_idx == WARGCOUNT(win) - 1
+    if (win->w_arg_idx == WARGCOUNT(win) - 1 && win->w_alist == &global_alist) {
-        && win->w_alist == &global_alist) {
       arg_had_last = true;
     }
   }
@@ -1150,8 +1149,7 @@ void do_argfile(exarg_T *eap, int argn)
     }
 
     curwin->w_arg_idx = argn;
-    if (argn == ARGCOUNT - 1
+    if (argn == ARGCOUNT - 1 && curwin->w_alist == &global_alist) {
-        && curwin->w_alist == &global_alist) {
       arg_had_last = true;
     }
 

src/nvim/move.c

@@ -786,8 +786,7 @@ void curs_columns(win_T *wp, int may_scroll)
     } else {
       wp->w_wrow = wp->w_height_inner - 1 - wp->w_empty_rows;
     }
-  } else if (wp->w_p_wrap
+  } else if (wp->w_p_wrap && wp->w_width_inner != 0) {
-             && wp->w_width_inner != 0) {
     width = textwidth + win_col_off2(wp);
 
     // long line wrapping, adjust wp->w_wrow
@@ -1083,8 +1082,7 @@ bool scrolldown(long line_count, int byfold)
    * and move the cursor onto the displayed part of the window.
    */
   int wrow = curwin->w_wrow;
-  if (curwin->w_p_wrap
+  if (curwin->w_p_wrap && curwin->w_width_inner != 0) {
-      && curwin->w_width_inner != 0) {
     validate_virtcol();
     validate_cheight();
     wrow += curwin->w_cline_height - 1 -

src/nvim/normal.c

@@ -6012,8 +6012,7 @@ static void nv_g_home_m_cmd(cmdarg_T *cap)
 
   cap->oap->motion_type = kMTCharWise;
   cap->oap->inclusive = false;
-  if (curwin->w_p_wrap
+  if (curwin->w_p_wrap && curwin->w_width_inner != 0) {
-      && curwin->w_width_inner != 0) {
     int width1 = curwin->w_width_inner - curwin_col_off();
     int width2 = width1 + curwin_col_off2();
 

src/nvim/tag.c

@@ -1863,6 +1863,7 @@ parse_line:
         // For "normal" tags: Do a quick check if the tag matches.
         // This speeds up tag searching a lot!
         if (orgpat.headlen) {
+          memset(&tagp, 0, sizeof(tagp));
           tagp.tagname = lbuf;
           tagp.tagname_end = (char_u *)vim_strchr((char *)lbuf, TAB);
           if (tagp.tagname_end == NULL) {
@@ -2784,7 +2785,7 @@ static int jumpto_tag(const char_u *lbuf_arg, int forceit, int keep_help)
     // A :ta from a help file will keep the b_help flag set.  For ":ptag"
     // we need to use the flag from the window where we came from.
     if (l_g_do_tagpreview != 0) {
-      keep_help_flag = curwin_save->w_buffer->b_help;
+      keep_help_flag = bt_help(curwin_save->w_buffer);
     } else {
       keep_help_flag = curbuf->b_help;
     }

src/nvim/testdir/test_normal.vim

@@ -2656,7 +2656,7 @@ func Test_normal49_counts()
 endfunc
 
 func Test_normal50_commandline()
-  if !has("timers") || !has("cmdline_hist") || !has("vertsplit")
+  if !has("timers") || !has("cmdline_hist")
     return
   endif
   func! DoTimerWork(id)