patch 9.0.1273: "1v" may select block with wrong size

Problem:    "1v" may select block with wrong size. (Evgeni Chasnovski)
Solution:   Compute "curswant" in the right line. (closes #11925)
diff --git a/src/normal.c b/src/normal.c
index 0bd6655..9a30067 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -5493,8 +5493,13 @@
 	    }
 	    else if (VIsual_mode == Ctrl_V)
 	    {
+		// Update curswant on the original line, that is where "col" is
+		// valid.
+		linenr_T lnum = curwin->w_cursor.lnum;
+		curwin->w_cursor.lnum = VIsual.lnum;
 		update_curswant_force();
-		curwin->w_curswant += + resel_VIsual_vcol * cap->count0 - 1;
+		curwin->w_curswant += resel_VIsual_vcol * cap->count0 - 1;
+		curwin->w_cursor.lnum = lnum;
 		coladvance(curwin->w_curswant);
 	    }
 	    else