In setSelections, default primary to old primary if not given

This makes it easier to update selections by mapping over them.

Author: marijnh

keymap/sublime.js

@@ -73,14 +73,13 @@
   map["Shift-Tab"] = "indentLess";
 
   cmds[map[ctrl + "L"] = "selectLine"] = function(cm) {
-    var ranges = cm.listSelections(), prim = cm.getCursor(), primIndex, extended = [];
+    var ranges = cm.listSelections(), extended = [];
     for (var i = 0; i < ranges.length; i++) {
       var range = ranges[i];
-      if (range.head == prim) primIndex = i;
       extended.push({anchor: Pos(range.from().line, 0),
                      head: Pos(range.to().line + 1, 0)});
     }
-    cm.setSelections(extended, primIndex);
+    cm.setSelections(extended);
   };
 
   function wordAt(cm, pos) {

lib/codemirror.js

@@ -6068,7 +6068,7 @@
       for (var i = 0, out = []; i < ranges.length; i++)
         out[i] = new Range(clipPos(this, ranges[i].anchor),
                            clipPos(this, ranges[i].head));
-      if (primary == null) primary = ranges.length - 1;
+      if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
       setSelection(this, normalizeSelection(out, primary), options);
     }),
     addSelection: docMethodOp(function(anchor, head, options) {