force using tabs in makefile and snippets modes

lib/ace/edit_session.js

@@ -461,7 +461,8 @@ var EditSession = function(text, mode) {
     * @returns {Boolean}
     **/
     this.getUseSoftTabs = function() {
-         return this.$useSoftTabs;
+        // todo might need more general way for changing settings from mode, but this is ok for now
+        return this.$useSoftTabs && !this.$mode.$indentWithTabs;
     };
     /**
     * Set the number of spaces that define a soft tab; for example, passing in `4` transforms the soft tabs to be equivalent to four spaces. This function also emits the `changeTabSize` event.

lib/ace/mode/makefile.js

@@ -57,7 +57,9 @@ oop.inherits(Mode, TextMode);
 
 (function() {
        
-    this.lineCommentStart = "#";
+    this.lineCommentStart = "#";    
+    this.$indentWithTabs = true;
+    
 }).call(Mode.prototype);
 
 exports.Mode = Mode;

lib/ace/mode/snippets.js

@@ -105,9 +105,7 @@ var Mode = function() {
 oop.inherits(Mode, TextMode);
 
 (function() {
-    this.getNextLineIndent = function(state, line, tab) {
-        return this.$getIndent(line);
-    };
+    this.$indentWithTabs = true;
 }).call(Mode.prototype);
 exports.Mode = Mode;