Soften hit-testing in SchEdit and LibEdit a bit.

Old threshold was 0; new is 5 pixels.

eeschema/ee_collectors.cpp

@@ -108,7 +108,7 @@ SEARCH_RESULT EE_COLLECTOR::Inspect( EDA_ITEM* aItem, void* aTestData )
             return SEARCH_CONTINUE;
     }
 
-    if( aItem->HitTest( m_RefPos ) )
+    if( aItem->HitTest( m_RefPos, m_Threshold ) )
         Append( aItem );
 
     return SEARCH_CONTINUE;
@@ -463,7 +463,7 @@ SEARCH_RESULT EE_TYPE_COLLECTOR::Inspect( EDA_ITEM* aItem, void* testData )
 }
 
 
-void EE_TYPE_COLLECTOR::Collect( SCH_ITEM* aItem, const KICAD_T aFilterList[] )
+void EE_TYPE_COLLECTOR::Collect( EDA_ITEM* aItem, const KICAD_T aFilterList[] )
 {
     Empty();        // empty the collection
 

eeschema/ee_collectors.h

@@ -46,6 +46,7 @@ public:
     static const KICAD_T SheetsAndSheetLabels[];
 
     EE_COLLECTOR( const KICAD_T* aScanTypes = EE_COLLECTOR::AllItems ) :
+        m_Threshold( 0 ),
         m_MenuCancelled( false )
     {
         SetScanTypes( aScanTypes );
@@ -107,6 +108,8 @@ public:
     int      m_Unit;            // Fixed symbol unit filter (for symbol editor)
     int      m_Convert;         // Fixed DeMorgan filter (for symbol editor)
 
+    int      m_Threshold;       // Hit-test threshold in internal units.
+
     wxString m_MenuTitle;       // The title of selection disambiguation menu (if needed)
     bool     m_MenuCancelled;   // Indicates selection disambiguation menu was cancelled
 };

eeschema/tools/ee_selection_tool.cpp

@@ -149,6 +149,9 @@ SELECTION_CONDITION EE_CONDITIONS::SingleMultiUnitSymbol = [] ( const SELECTION&
 };
 
 
+#define HITTEST_THRESHOLD_PIXELS 5
+
+
 EE_SELECTION_TOOL::EE_SELECTION_TOOL() :
         TOOL_INTERACTIVE( "eeschema.InteractiveSelection" ),
         m_frame( nullptr ),
@@ -425,6 +428,7 @@ EDA_ITEM* EE_SELECTION_TOOL::SelectPoint( const VECTOR2I& aWhere, const KICAD_T*
     if( !start )
         return nullptr;
 
+    collector.m_Threshold = KiROUND( getView()->ToWorld( HITTEST_THRESHOLD_PIXELS ) );
     collector.Collect( start, aFilterList, (wxPoint) aWhere, m_unit, m_convert );
 
     bool anyCollected = collector.GetCount() != 0;