fix , in visual mode (#256)

Author: nightwing

src/vim.js

@@ -2682,11 +2682,9 @@ export function initVim(CM) {
       var repeat = motionArgs.repeat;
       var forward = motionArgs.forward === lastSearch.forward;
       var increment = (lastSearch.increment ? 1 : 0) * (forward ? -1 : 1);
-      cm.moveH(-increment, 'char');
       motionArgs.inclusive = forward ? true : false;
-      var curEnd = moveToCharacter(cm, repeat, forward, lastSearch.selectedCharacter);
+      var curEnd = moveToCharacter(cm, repeat, forward, lastSearch.selectedCharacter, offsetCursor(head, 0, -increment));
       if (!curEnd) {
-        cm.moveH(increment, 'char');
         return head;
       }
       curEnd.ch += increment;

test/vim_test.js

@@ -3877,6 +3877,23 @@ testVim('vFT', function(cm, vim, helpers) {
   helpers.doKeys('F', '1');
   helpers.assertCursorAt(0, 0);
 }, { value: '1123 123 123'});
+testVim('vf,;', function(cm, vim, helpers) { 
+  helpers.doKeys('0', 'v')
+  helpers.doKeys('f', '.');
+  eq('ab.', cm.getSelection());
+  helpers.doKeys(';');
+  eq('ab.cd.', cm.getSelection());
+  helpers.doKeys(';');
+  eq('ab.cd.ef.', cm.getSelection());
+  helpers.doKeys(',');
+  eq('ab.cd.', cm.getSelection()); 
+  helpers.doKeys(';');
+  eq('ab.cd.ef.', cm.getSelection());
+  helpers.doKeys('2', ',');
+  eq('ab.', cm.getSelection());
+  helpers.doKeys('2', ',');
+  eq('ab.', cm.getSelection());
+}, { value: 'ab.cd.ef.g'});
 testVim('page_motions', function(cm, vim, helpers) {
   var value = "x".repeat(200).split("").map((_, i)=>i).join("\n");
   cm.setValue(value);