Improve hittesting for Eeschema and LibEdit delete tools.

eeschema/tools/ee_picker_tool.cpp

@@ -40,12 +40,15 @@ int EE_PICKER_TOOL::Main( const TOOL_EVENT& aEvent )
     KIGFX::VIEW_CONTROLS* controls = getViewControls();
     int                   finalize_state = WAIT_CANCEL;
 
+    // To many things are off-grid in LibEdit; turn snapping off.
+    bool                  snap = !m_isLibEdit;
+
     setControls();
 
     while( TOOL_EVENT* evt = Wait() )
     {
         m_frame->GetCanvas()->SetCurrentCursor( wxCURSOR_BULLSEYE );
-        VECTOR2D cursorPos = controls->GetCursorPosition( !evt->Modifier( MD_ALT ) );
+        VECTOR2D cursorPos = controls->GetCursorPosition( snap && !evt->Modifier( MD_ALT ) );
 
         if( evt->IsClick( BUT_LEFT ) )
         {

eeschema/tools/ee_selection_tool.cpp

@@ -482,7 +482,7 @@ EDA_ITEM* EE_SELECTION_TOOL::SelectPoint( const VECTOR2I& aWhere, const KICAD_T*
     // Apply some ugly heuristics to avoid disambiguation menus whenever possible
     if( collector.GetCount() > 1 && !m_skip_heuristics )
     {
-        guessSelectionCandidates( collector, aWhere );
+        GuessSelectionCandidates( collector, aWhere );
     }
 
     // If still more than one item we're going to have to ask the user.
@@ -516,12 +516,12 @@ EDA_ITEM* EE_SELECTION_TOOL::SelectPoint( const VECTOR2I& aWhere, const KICAD_T*
 }
 
 
-void EE_SELECTION_TOOL::guessSelectionCandidates( EE_COLLECTOR& collector, const VECTOR2I& aPos )
+void EE_SELECTION_TOOL::GuessSelectionCandidates( EE_COLLECTOR& collector, const VECTOR2I& aPos )
 {
     // There are certain parent/child and enclosure combinations that can be handled
     // automatically.
 
-    // Prefer exact hits to a sloppy ones
+    // Prefer exact hits to sloppy ones
     int exactHits = 0;
 
     for( int i = collector.GetCount() - 1; i >= 0; --i )

eeschema/tools/ee_selection_tool.h

@@ -130,6 +130,12 @@ public:
 
     void ClearSelection();
 
+    /**
+     * Apply heuristics to try and determine a single object when multiple are found under the
+     * cursor.
+     */
+    void GuessSelectionCandidates( EE_COLLECTOR& collector, const VECTOR2I& aPos );
+
     /**
      * Function SelectionMenu()
      * Shows a popup menu to trim the COLLECTOR passed as aEvent's parameter down to a single
@@ -155,12 +161,6 @@ private:
      */
     bool selectMultiple();
 
-    /**
-     * Apply heuristics to try and determine a single object when multiple are found under the
-     * cursor.
-     */
-    void guessSelectionCandidates( EE_COLLECTOR& collector, const VECTOR2I& aWhere );
-
     /**
      * Allows the selection of a single item from a list via pop-up menu.  The items are
      * highlighted on the canvas when hovered in the menu.  The collector is trimmed to

eeschema/tools/lib_edit_tool.cpp

@@ -307,12 +307,14 @@ int LIB_EDIT_TOOL::DeleteItemCursor( const TOOL_EVENT& aEvent )
         EE_COLLECTOR collector;
         collector.m_Threshold = KiROUND( getView()->ToWorld( HITTEST_THRESHOLD_PIXELS ) );
         collector.Collect( m_frame->GetCurPart(), nonFields, (wxPoint) aPos );
+
+        EE_SELECTION_TOOL* selectionTool = m_toolMgr->GetTool<EE_SELECTION_TOOL>();
+        selectionTool->GuessSelectionCandidates( collector, aPos );
+
         EDA_ITEM* item = collector.GetCount() == 1 ? collector[ 0 ] : nullptr;
 
         if( m_pickerItem != item )
         {
-            EE_SELECTION_TOOL* selectionTool = m_toolMgr->GetTool<EE_SELECTION_TOOL>();
-
             if( m_pickerItem )
                 selectionTool->UnbrightenItem( m_pickerItem );
 

eeschema/tools/sch_edit_tool.cpp

@@ -979,12 +979,14 @@ int SCH_EDIT_TOOL::DeleteItemCursor( const TOOL_EVENT& aEvent )
         EE_COLLECTOR collector;
         collector.m_Threshold = KiROUND( getView()->ToWorld( HITTEST_THRESHOLD_PIXELS ) );
         collector.Collect( m_frame->GetScreen()->GetDrawItems(), deletableItems, (wxPoint) aPos );
+
+        EE_SELECTION_TOOL* selectionTool = m_toolMgr->GetTool<EE_SELECTION_TOOL>();
+        selectionTool->GuessSelectionCandidates( collector, aPos );
+
         EDA_ITEM* item = collector.GetCount() == 1 ? collector[ 0 ] : nullptr;
 
         if( m_pickerItem != item )
         {
-            EE_SELECTION_TOOL* selectionTool = m_toolMgr->GetTool<EE_SELECTION_TOOL>();
-
             if( m_pickerItem )
                 selectionTool->UnbrightenItem( m_pickerItem );