Adds two actions to indent and unindent a selection.

Add actions to the basetexteditor to indent and unindent a selection.  These actions
are equivalent to Key_Tab and Key_BackTab respectively.  The advantage of having
actions here is the user can override them and assign any key binding they want.
Thus, I could assign Ctrl+I and Shift+Ctrl+I to them and have the same behavior
as Kate.

Change-Id: I0a305a7b45018072a78f2880ea15650ea92095a1
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/plugins/texteditor/basetexteditor.cpp

@@ -1063,6 +1063,16 @@ void BaseTextEditorWidget::lowercaseSelection()
     transformSelection(&QString::toLower);
 }
 
+void BaseTextEditorWidget::indent()
+{
+    indentOrUnindent(true);
+}
+
+void BaseTextEditorWidget::unindent()
+{
+    indentOrUnindent(false);
+}
+
 void BaseTextEditorWidget::moveLineUpDown(bool up)
 {
     QTextCursor cursor = textCursor();