Do not format current table line directly in get_rows()

This formatting is needed in the optimized table formatting algorithm
for shrinking the current table line to try the best to avoid
re-formatting the whole table. However, this breaks cursor motion and
may also affect other table related behaviors. The fix is to move this
formatting to get_aligned_rows(). Now table rows are not affected by any
means, because the current row is only replaced temporarily for the
formatting purpose only and gets reverted as soon as the check is
finished.

Fixes #656.

autoload/vimwiki/tbl.vim

@@ -254,13 +254,6 @@ function! s:get_rows(lnum, ...)
   while lnum <= line('$')
     let line = getline(lnum)
     if s:is_table(line)
-      if lnum == a:lnum && !s:is_separator(line)
-        let cells = vimwiki#tbl#get_cells(line)
-        let clen = len(cells)
-        let max_lens = repeat([0], clen)
-        let aligns = repeat(['left'], clen)
-        let line = s:fmt_row(cells, max_lens, aligns, 0, 0)
-      endif
       call add(rows, [lnum, line])
     else
       break
@@ -335,6 +328,14 @@ function! s:get_aligned_rows(lnum, col1, col2, depth)
     let startlnum = rows[0][0]
     let lrows = len(rows)
     if lrows == a:depth + 1
+      let line = rows[-1][1]
+      if !s:is_separator(line)
+        let lcells = vimwiki#tbl#get_cells(line)
+        let lclen = len(lcells)
+        let lmax_lens = repeat([0], lclen)
+        let laligns = repeat(['left'], lclen)
+        let rows[-1][1] = s:fmt_row(lcells, lmax_lens, laligns, 0, 0)
+      endif
       let i = 1
       for [lnum, row] in rows
         call add(cells, vimwiki#tbl#get_cells(row, i != lrows - 1))
@@ -348,6 +349,7 @@ function! s:get_aligned_rows(lnum, col1, col2, depth)
       endif
       let fst_lens = s:get_cell_max_lens(a:lnum, cells, startlnum, rows[0:0])
       let check_all = max_lens != fst_lens
+      let rows[-1][1] = line
     endif
   endif
   if check_all