Add DropLocation_Horizontal and DropLocation_Vertical

So we can quickly use a bitwise and to see if an arbitrary
drop location is vertical or horizontal.

src/KDDockWidgets.h

@@ -249,7 +249,9 @@ enum DropLocation
     DropLocation_OutterRight = 128,
     DropLocation_OutterBottom = 256,
     DropLocation_Inner = DropLocation_Left | DropLocation_Right | DropLocation_Top | DropLocation_Bottom,
-    DropLocation_Outter = DropLocation_OutterLeft | DropLocation_OutterRight | DropLocation_OutterTop | DropLocation_OutterBottom
+    DropLocation_Outter = DropLocation_OutterLeft | DropLocation_OutterRight | DropLocation_OutterTop | DropLocation_OutterBottom,
+    DropLocation_Horizontal = DropLocation_Left | DropLocation_Right | DropLocation_OutterLeft | DropLocation_OutterRight,
+    DropLocation_Vertical = DropLocation_Top | DropLocation_Bottom | DropLocation_OutterTop | DropLocation_OutterBottom
 };
 Q_ENUM_NS(DropLocation)
 

src/private/DropIndicatorOverlayInterface.cpp

@@ -112,6 +112,8 @@ KDDockWidgets::Location DropIndicatorOverlayInterface::multisplitterLocationFor(
         return KDDockWidgets::Location_None;
     case DropLocation_Inner:
     case DropLocation_Outter:
+    case DropLocation_Horizontal:
+    case DropLocation_Vertical:
         qWarning() << Q_FUNC_INFO << "Unexpected drop location" << dropLoc;
         break;
     }

src/private/indicators/ClassicIndicatorsWindow.cpp

@@ -54,6 +54,8 @@ static QString iconName(DropLocation loc, bool active)
     case DropLocation_None:
     case DropLocation_Inner:
     case DropLocation_Outter:
+    case DropLocation_Horizontal:
+    case DropLocation_Vertical:
         return QString();
     }
 
@@ -171,6 +173,8 @@ Indicator *IndicatorWindow::indicatorForLocation(DropLocation loc) const
     case DropLocation_None:
     case DropLocation_Outter:
     case DropLocation_Inner:
+    case DropLocation_Horizontal:
+    case DropLocation_Vertical:
         return nullptr;
     }