Added image for missing QTreeView/QListView state, fix #92 (#97)

* Added image for the missing QTreeView/QListView undeterminated state, fix #92
* Add entry to CHANGES and AUTHORS

AUTHORS.md

@@ -20,5 +20,6 @@ Please, insert your information after the last one.
 
 - Year - Name - `<contact>` - contribution.
 - 2018 - Xingyun Wu - `xingyun.wu@foxmail.com` - bug fixes.
+- 2018 - [KcHNST](https://github.com/KcHNST) - bug fixes.
 
-Thank you all!
+Thank you all!

CHANGES.md

@@ -3,6 +3,7 @@
 - 2.5.4
   - Fix indicator image of checkable QGroupBox for check/uncheck states, #93 
   - Fix wrong comma position, #95
+  - Added image for the missing QTreeView/QListView undeterminated state, fix #92
 - 2.5.3
   - Add future warning and pending deprecation for 3.0 version preparation #89
   - Add ISSUE_TEMPLATE to ask for default information on issue tracker

qdarkstyle/style.qss

@@ -912,6 +912,11 @@ QListView::indicator:unchecked {
     image: url(:/qss_icons/rc/checkbox_unchecked.png);
 }
 
+QTreeView::indicator:indeterminate,
+QListView::indicator:indeterminate {
+    image: url(:/qss_icons/rc/checkbox_indeterminate.png);
+}
+
 QTreeView::indicator:checked:hover,
 QTreeView::indicator:checked:focus,
 QTreeView::indicator:checked:pressed,
@@ -930,6 +935,15 @@ QListView::indicator:unchecked:pressed {
     image: url(:/qss_icons/rc/checkbox_unchecked_focus.png);
 }
 
+QTreeView::indicator:indeterminate:hover,
+QTreeView::indicator:indeterminate:focus,
+QTreeView::indicator:indeterminate:pressed,
+QListView::indicator:indeterminate:hover,
+QListView::indicator:indeterminate:focus,
+QListView::indicator:indeterminate:pressed {
+    image: url(:/qss_icons/rc/checkbox_indeterminate_focus.png);
+}
+
 QSlider::groove:horizontal {
     border: 1px solid #565a5e;
     height: 4px;