QmlDesigner: Remove hover effect from tab bar

In the property editor there is no hover effect.
The hover effect is simply not required.

Change-Id: I7e918be7e0ac2186fa02c2cae30ad19e90e8ac75
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/qmldesigner/components/resources/stylesheet.css

@@ -130,11 +130,6 @@ QTabBar::tab {
     color: #EEEEEE;
 }
 
-QTabBar::tab:hover {
-    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-    stop: 0 #3c3c3c, stop: 1 #666666);
-}
-
 QTabBar::tab:selected {
     border: none; /* no border for a flat push button */
     background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,

src/plugins/qmldesigner/qmldesignerextension/connectioneditor/connectioneditor.qrc

@@ -1,7 +1,6 @@
 <RCC>
     <qresource prefix="/connectionview">
         <file>stylesheet.css</file>
-        <file>panelselected.png</file>
         <file>plus.png</file>
         <file>minus.png</file>
     </qresource>

src/plugins/qmldesigner/qmldesignerextension/connectioneditor/stylesheet.css

@@ -123,11 +123,6 @@ QStackedWidget {
     background-color: #4f4f4f;
 }
 
-QTabBar::tab:hover {
-    image: url(:/connectionview/panelselected.png);
-    border-width: 2px;
-}
-
 QTabBar::tab:selected {
     border: none;
     border-image: none;

src/plugins/qmldesigner/qmldesignerplugin.qbs

@@ -584,7 +584,6 @@ Project {
                 "connectioneditor/dynamicpropertiesmodel.cpp",
                 "connectioneditor/dynamicpropertiesmodel.h",
                 "connectioneditor/minus.png",
-                "connectioneditor/panelselected.png",
                 "connectioneditor/plus.png",
                 "connectioneditor/stylesheet.css",
                 "pathtool/controlpoint.cpp",