Remove code that was added based on the wrong assumption of using indentUnit CM option for tab size.

Author: RaymondLim

src/editor/Editor.js

@@ -2005,7 +2005,6 @@ define(function (require, exports, module) {
 
         if (oldValue !== newValue) {
             this._currentOptions[prefName] = newValue;
-            var useTabChar = this._currentOptions[USE_TAB_CHAR];
 
             if (prefName === USE_TAB_CHAR) {
                 this._codeMirror.setOption(cmOptions[prefName], newValue);
@@ -2018,9 +2017,6 @@ define(function (require, exports, module) {
             } else if (prefName === SCROLL_PAST_END && this._visibleRange) {
                 // Do not apply this option to inline editors
                 return;
-            } else if ((useTabChar && prefName === SPACE_UNITS) || (!useTabChar && prefName === TAB_SIZE)) {
-                // This change conflicts with the useTabChar setting, so do not change the CodeMirror option
-                return;
             } else {
                 this._codeMirror.setOption(cmOptions[prefName], newValue);
             }