add resources for tree view icons in custom themes

CHANGELOG.md

@@ -51,6 +51,7 @@ The **"Breaking Changes"** listed below are changes that have been made in the d
 - Fix cursor tile and player view outlines not updating immediately when toggled in Collision view.
 - Fix selected space not updating while painting in Collision view.
 - Fix collision values of 2 or 3 not rendering properly.
+- Fix the map tree view arrows not displaying for custom themes.
 - Fix the map music dropdown being empty when importing a map from Advance Map.
 - Fix object events added by pasting ignoring the map event limit.
 - Fix a bug where saving the tileset editor would reselect the main editor's first selected metatile.

resources/images.qrc

@@ -39,6 +39,14 @@
         <file>icons/ui/dark_checkbox_unchecked_disabled@2x.png</file>
         <file>icons/ui/dark_checkbox_unchecked.png</file>
         <file>icons/ui/dark_checkbox_unchecked@2x.png</file>
+        <file>icons/ui/dark_branch_closed.png</file>
+        <file>icons/ui/dark_branch_closed@2x.png</file>
+        <file>icons/ui/dark_branch_open.png</file>
+        <file>icons/ui/dark_branch_open@2x.png</file>
+        <file>icons/ui/dark_branch_end.png</file>
+        <file>icons/ui/dark_branch_end@2x.png</file>
+        <file>icons/ui/dark_branch_more.png</file>
+        <file>icons/ui/dark_branch_more@2x.png</file>
         <file>icons/ui/midnight_checkbox_checked_disabled.png</file>
         <file>icons/ui/midnight_checkbox_checked_disabled@2x.png</file>
         <file>icons/ui/midnight_checkbox_checked.png</file>
@@ -47,6 +55,14 @@
         <file>icons/ui/midnight_checkbox_unchecked_disabled@2x.png</file>
         <file>icons/ui/midnight_checkbox_unchecked.png</file>
         <file>icons/ui/midnight_checkbox_unchecked@2x.png</file>
+        <file>icons/ui/midnight_branch_closed.png</file>
+        <file>icons/ui/midnight_branch_closed@2x.png</file>
+        <file>icons/ui/midnight_branch_open.png</file>
+        <file>icons/ui/midnight_branch_open@2x.png</file>
+        <file>icons/ui/midnight_branch_end.png</file>
+        <file>icons/ui/midnight_branch_end@2x.png</file>
+        <file>icons/ui/midnight_branch_more.png</file>
+        <file>icons/ui/midnight_branch_more@2x.png</file>
         <file>images/blank_tileset.png</file>
         <file>images/collisions.png</file>
         <file>images/Entities_16x16.png</file>

resources/themes/dark.qss

@@ -246,6 +246,30 @@ QTreeView::branch {
     background: #19232D;
 }
 
+QTreeView::branch:has-siblings:!adjoins-item {
+    border-image: url(:/icons/ui/dark_vline.png) 0;
+}
+
+QTreeView::branch:has-siblings:adjoins-item {
+    border-image: url(:/icons/ui/dark_branch_more.png) 0;
+}
+
+QTreeView::branch:!has-children:!has-siblings:adjoins-item {
+    border-image: url(:/icons/ui/dark_branch_end.png) 0;
+}
+
+QTreeView::branch:has-children:!has-siblings:closed,
+QTreeView::branch:closed:has-children:has-siblings {
+        border-image: none;
+        image: url(:/icons/ui/dark_branch_closed.png);
+}
+
+QTreeView::branch:open:has-children:!has-siblings,
+QTreeView::branch:open:has-children:has-siblings  {
+        border-image: none;
+        image: url(:/icons/ui/dark_branch_open.png);
+}
+
 /* Scroll Bar */
 
 QScrollBar::vertical {

resources/themes/midnight.qss

@@ -245,6 +245,30 @@ QTreeView::branch {
     background: #272822;
 }
 
+QTreeView::branch:has-siblings:!adjoins-item {
+    border-image: url(:/icons/ui/midnight_vline.png) 0;
+}
+
+QTreeView::branch:has-siblings:adjoins-item {
+    border-image: url(:/icons/ui/midnight_branch_more.png) 0;
+}
+
+QTreeView::branch:!has-children:!has-siblings:adjoins-item {
+    border-image: url(:/icons/ui/midnight_branch_end.png) 0;
+}
+
+QTreeView::branch:has-children:!has-siblings:closed,
+QTreeView::branch:closed:has-children:has-siblings {
+        border-image: none;
+        image: url(:/icons/ui/midnight_branch_closed.png);
+}
+
+QTreeView::branch:open:has-children:!has-siblings,
+QTreeView::branch:open:has-children:has-siblings  {
+        border-image: none;
+        image: url(:/icons/ui/midnight_branch_open.png);
+}
+
 /* Scroll Bar */
 
 QScrollBar::vertical {