Add hotkey (Insert) for zone create corner

Adds a hotkey to the TOOL_ACTION, and also checks for
action validity prior to running the actions (previously
implicitly gated by  the enablement of the menu item).

pcbnew/hotkeys.cpp

@@ -310,6 +310,9 @@ static EDA_HOTKEY HkToggleCursor( _HKI( "Toggle Cursor Display (Modern Toolset o
 static EDA_HOTKEY HkMeasureTool( _HKI( "Measure Distance (Modern Toolset only)" ),
                                  HK_MEASURE_TOOL, 'M' + GR_KB_SHIFTCTRL );
 
+static EDA_HOTKEY HkInsertCorner( _HKI( "Insert Corner (Modern Toolset only)" ),
+                                 HK_INSERT_CORNER, WXK_INSERT );
+
 // List of common hotkey descriptors
 EDA_HOTKEY* common_Hotkey_List[] =
 {
@@ -384,6 +387,9 @@ EDA_HOTKEY* board_edit_Hotkey_List[] =
     &HkZoneFillOrRefill,
     &HkZoneRemoveFilled,
 
+    // Point editor (zones and segments)
+    &HkInsertCorner,
+
     // Highlight and display
     &HkSelectConnection,
     &HkSelectCopper,

pcbnew/hotkeys.h

@@ -133,7 +133,8 @@ enum hotkey_id_commnand {
     HK_DP_DIMENSIONS,
     HK_VIA_SIZE_INC,
     HK_VIA_SIZE_DEC,
-    HK_HIGHLIGHT_NET_SELECTION
+    HK_HIGHLIGHT_NET_SELECTION,
+    HK_INSERT_CORNER
 };
 
 // Full list of hotkey descriptors for board editor and footprint editor

pcbnew/tools/point_editor.cpp

@@ -50,7 +50,7 @@ using namespace std::placeholders;
 
 // Point editor
 TOOL_ACTION PCB_ACTIONS::pointEditorAddCorner( "pcbnew.PointEditor.addCorner",
-        AS_GLOBAL, 0,
+        AS_GLOBAL, WXK_INSERT,
         _( "Create Corner" ), _( "Create a corner" ), add_corner_xpm );
 
 TOOL_ACTION PCB_ACTIONS::pointEditorRemoveCorner( "pcbnew.PointEditor.removeCorner",
@@ -850,17 +850,25 @@ void POINT_EDITOR::setTransitions()
 }
 
 
+bool POINT_EDITOR::canAddCorner( const EDA_ITEM& aItem )
+{
+    const auto type = aItem.Type();
+
+    // Works only for zones and line segments
+    return type == PCB_ZONE_AREA_T ||
+           ( ( type == PCB_LINE_T || type == PCB_MODULE_EDGE_T ) &&
+               static_cast<const DRAWSEGMENT&>( aItem ).GetShape() == S_SEGMENT );
+}
+
+
 bool POINT_EDITOR::addCornerCondition( const SELECTION& aSelection )
 {
     if( aSelection.Size() != 1 )
         return false;
 
-    auto item = aSelection.Front();
+    const EDA_ITEM* item = aSelection.Front();
 
-    // Works only for zones and line segments
-    return item->Type() == PCB_ZONE_AREA_T ||
-           ( ( item->Type() == PCB_LINE_T || item->Type() == PCB_MODULE_EDGE_T ) &&
-               static_cast<DRAWSEGMENT*>( item )->GetShape() == S_SEGMENT );
+    return ( item != nullptr ) && canAddCorner( *item );
 }
 
 
@@ -916,9 +924,17 @@ bool POINT_EDITOR::removeCornerCondition( const SELECTION& )
 
 int POINT_EDITOR::addCorner( const TOOL_EVENT& aEvent )
 {
+    if( !m_editPoints )
+        return 0;
+
     EDA_ITEM* item = m_editPoints->GetParent();
     PCB_BASE_EDIT_FRAME* frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
     const VECTOR2I& cursorPos = getViewControls()->GetCursorPosition();
+
+    // called without an active edited polygon
+    if( !item || !canAddCorner( *item ) )
+        return 0;
+
     BOARD_COMMIT commit( frame );
 
     if( item->Type() == PCB_ZONE_AREA_T )

pcbnew/tools/point_editor.h

@@ -129,6 +129,9 @@ private:
     ///> Condition to display "Create corner" context menu entry.
     static bool addCornerCondition( const SELECTION& aSelection );
 
+    ///> Determine if the tool can currently add a corner to the given item
+    static bool canAddCorner( const EDA_ITEM& aItem );
+
     ///> Condition to display "Remove corner" context menu entry.
     bool removeCornerCondition( const SELECTION& aSelection );