Qt style defined for the "partially check" widget state.

GUI_main/mainapp.qrc

@@ -38,6 +38,7 @@
     <file alias="Default.css">resources/style/Default.css</file>
     <file alias="Palette.css">resources/style/Palette.css</file>
     <file alias="QCheckBox.png">resources/style/QCheckBox.png</file>
+    <file alias="QCheckBoxPartial.png">resources/style/QCheckBoxPartial.png</file>
     <file alias="QRadioButton.png">resources/style/QRadioButton.png</file>
     <file alias="QHeaderViewUpArrow.png">resources/style/QHeaderViewUpArrow.png</file>
     <file alias="QHeaderViewDownArrow.png">resources/style/QHeaderViewDownArrow.png</file>

GUI_main/resources/style/Default.css

@@ -115,6 +115,14 @@ QCheckBox::indicator:checked:disabled, QTreeView::indicator:checked:disabled, QT
 {
 	image: url([QCheckBox:disabled:base]);
 }
+QCheckBox::indicator:indeterminate, QTreeView::indicator:indeterminate, QTableView::indicator:indeterminate, QListView::indicator:indeterminate
+{
+	image: url([QCheckBoxPartial:bright-text]);
+}
+QCheckBox::indicator:indeterminate:disabled, QTreeView::indicator:indeterminate:disabled, QTableView::indicator:indeterminate:disabled, QListView::indicator:indeterminate:disabled
+{
+	image: url([QCheckBoxPartial:disabled:base]);
+}
 
 
 QRadioButton