Fix a couple of bugs in intersheet references.

1) init reference pages before trying to draw the SCH_FIELDs when
turning intersheet references on

2) don't double redraw because we accidentally cleared the last
hover item on a non-mouse-moved event.

3) make sure the root sheet gets a name for the hypertext menu.

eeschema/files-io.cpp

@@ -539,7 +539,7 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
     m_toolManager->RunAction( ACTIONS::zoomFitScreen, true );
     SetSheetNumberAndCount();
 
-    RecomputeIntersheetsRefs();
+    RecomputeIntersheetRefs();
 
     // re-create junctions if needed. Eeschema optimizes wires by merging
     // colinear segments. If a schematic is saved without a valid

eeschema/sch_edit_frame.cpp

@@ -1285,13 +1285,13 @@ void SCH_EDIT_FRAME::RecalculateConnections( SCH_CLEANUP_FLAGS aCleanupFlags )
     wxLogTrace( "CONN_PROFILE", "SchematicCleanUp() %0.4f ms", timer.msecs() );
 
     if( settings.m_IntersheetRefsShow == true )
-        RecomputeIntersheetsRefs();
+        RecomputeIntersheetRefs();
 
     Schematic().ConnectionGraph()->Recalculate( list, true );
 }
 
 
-int SCH_EDIT_FRAME::RecomputeIntersheetsRefs()
+int SCH_EDIT_FRAME::RecomputeIntersheetRefs()
 {
     std::map<wxString, std::set<wxString>>& pageRefsMap = Schematic().GetPageRefsMap();
 
@@ -1348,6 +1348,9 @@ int SCH_EDIT_FRAME::RecomputeIntersheetsRefs()
 
 void SCH_EDIT_FRAME::ShowAllIntersheetRefs( bool aShow )
 {
+    if( aShow )
+        RecomputeIntersheetRefs();
+
     SCH_SCREENS screens( Schematic().Root() );
 
     for( SCH_SCREEN* screen = screens.GetFirst(); screen; screen = screens.GetNext() )

eeschema/sch_edit_frame.h

@@ -927,7 +927,12 @@ public:
      */
     void UpdateSymbolFromEditor( const LIB_PART& aSymbol );
 
-    int RecomputeIntersheetsRefs();
+    /**
+     * Update the schematic's page reference map for all global labels, and refresh the labels
+     * so that they are redrawn with up-to-date references.
+     * @return
+     */
+    int RecomputeIntersheetRefs();
 
     void ShowAllIntersheetRefs( bool aShow );
 

eeschema/sch_field.cpp

@@ -472,15 +472,18 @@ void SCH_FIELD::DoHypertextMenu( EDA_DRAW_FRAME* aFrame )
             std::sort( pageListCopy.begin(), pageListCopy.end() );
 
             for( const SCH_SHEET_PATH& sheet : Schematic()->GetSheets() )
+            {
+                if( sheet.size() == 1 )
+                    sheetNames[ sheet.GetPageNumber() ] = _( "<root sheet>" );
+                else
                     sheetNames[ sheet.GetPageNumber() ] = sheet.Last()->GetName();
+            }
 
             for( const wxString& pageNo : pageListCopy )
             {
-                wxString pageName = pageNo == "/" ? _( "Root" ) : sheetNames[ pageNo ];
-
                 menu.Append( -1, wxString::Format( _( "Go to Page %s (%s)" ),
                                                    pageNo,
-                                                   pageName ) );
+                                                   sheetNames[ pageNo ] ) );
             }
 
             menu.AppendSeparator();

eeschema/tools/ee_selection_tool.cpp

@@ -307,7 +307,7 @@ int EE_SELECTION_TOOL::Main( const TOOL_EVENT& aEvent )
     while( TOOL_EVENT* evt = Wait() )
     {
         bool displayWireCursor = false;
-        KIID rolloverItem = niluuid;
+        KIID rolloverItem = lastRolloverItem;
         m_additive = m_subtractive = m_exclusive_or = false;
 
         if( evt->Modifier( MD_SHIFT ) && evt->Modifier( MD_CTRL ) )
@@ -496,6 +496,7 @@ int EE_SELECTION_TOOL::Main( const TOOL_EVENT& aEvent )
         }
         else if( evt->IsMotion() && !m_isSymbolEditor && m_frame->ToolStackIsEmpty() )
         {
+            rolloverItem = niluuid;
             EE_COLLECTOR collector;
 
             // We are checking if we should display a pencil when hovering over anchors