rename FxLine directly in a QLineEdit (#2918)

* rename FxLine directly in a QLineEdit

* set project modified only if FxLine text is changed

* clean up some code. Optimize some things

* optimizing code / removing a couple of member variables

* minor code optimizations

* turn off the tool tip in rename mode / minor code changes

data/themes/classic/style.css

@@ -35,6 +35,12 @@ QLineEdit {
 	color: #e0e0e0;
 }
 
+
+QLineEdit:read-only {
+	border-style: none;
+	background: transparent;
+}
+
 /* text box when it wants text */
 
 QLineEdit:focus {

data/themes/default/style.css

@@ -32,6 +32,11 @@ QLineEdit {
 	color: #d1d8e4;
 }
 
+QLineEdit:read-only {
+	border-style: none;
+	background: transparent;
+}
+
 /* text box when it wants text */
 
 QLineEdit:focus {