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	fix(move): consume skipcol before revealing filler lines (#34143)
Problem:  When scrolling (the text) down with 'smoothscroll', filler
          lines are revealed before the text skipped with `w_skipcol`.
Solution: Check `w_skipcol` before filler lines.
			
			
This commit is contained in:
		@@ -1335,13 +1335,10 @@ bool scrolldown(win_T *wp, linenr_T line_count, int byfold)
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  hasFolding(wp, wp->w_topline, &wp->w_topline, NULL);
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  validate_cursor(wp);            // w_wrow needs to be valid
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  for (int todo = line_count; todo > 0; todo--) {
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    if (wp->w_topfill < win_get_fill(wp, wp->w_topline)
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        && wp->w_topfill < wp->w_view_height - 1) {
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      wp->w_topfill++;
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      done++;
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    } else {
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    bool can_fill = wp->w_topfill < wp->w_view_height - 1
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                    && wp->w_topfill < win_get_fill(wp, wp->w_topline);
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    // break when at the very top
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      if (wp->w_topline == 1 && (!do_sms || wp->w_skipcol < width1)) {
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    if (wp->w_topline == 1 && !can_fill && (!do_sms || wp->w_skipcol < width1)) {
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      break;
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    }
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    if (do_sms && wp->w_skipcol >= width1) {
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@@ -1353,6 +1350,9 @@ bool scrolldown(win_T *wp, linenr_T line_count, int byfold)
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      }
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      redraw_later(wp, UPD_NOT_VALID);
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      done++;
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    } else if (can_fill) {
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      wp->w_topfill++;
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      done++;
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    } else {
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      // scroll a text line down
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      wp->w_topline--;
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@@ -1387,7 +1387,6 @@ bool scrolldown(win_T *wp, linenr_T line_count, int byfold)
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        }
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      }
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    }
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    }
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    wp->w_botline--;                // approximate w_botline
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    invalidate_botline(wp);
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  }
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@@ -6677,6 +6677,33 @@ if (h->n_buckets < new_n_buckets) { // expand
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      ]],
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    })
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  end)
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  it("not revealed before skipcol scrolling up with 'smoothscroll'", function()
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    api.nvim_set_option_value('smoothscroll', true, {})
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    api.nvim_buf_set_lines(0, 0, -1, false, { ('x'):rep(screen._width * 2) })
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    api.nvim_buf_set_extmark(0, ns, 0, 0, { virt_lines_above = true, virt_lines = { { { 'VIRT1' } } } } )
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    feed('<C-E>')
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    screen:expect([[
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      {1:<<<}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx^x|
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      {1:~                                                 }|*10
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                                                        |
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    ]])
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    feed('<C-Y>')
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    screen:expect([[
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      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx|
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      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx^x|
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      {1:~                                                 }|*9
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                                                        |
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    ]])
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    feed('<C-Y>')
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    screen:expect([[
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      VIRT1                                             |
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      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx|
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      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx^x|
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      {1:~                                                 }|*8
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                                                        |
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    ]])
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    end)
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end)
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describe('decorations: signs', function()
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