tdf#116816: Show/hide notes takes too much time to run

The commands show/hide notes take too much time to run,
while they check all cells for notes, it is better to
check registered notes and then check if they are in
selected range.

Change-Id: I6a65dc974af7d62430c6f48a9061dcb2594fea00
Reviewed-on: https://gerrit.libreoffice.org/52451Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

sc/source/ui/view/cellsh1.cxx

@@ -2281,31 +2281,31 @@ void ScCellShell::ExecuteEdit( SfxRequest& rReq )
                     bool bDone = false;
                     ScRangeListRef aRangesRef;
                     pData->GetMultiArea(aRangesRef);
-                    ScRangeList aRanges = *aRangesRef;
-                    size_t nRangeSize = aRanges.size();
+                    const ScRangeList aRanges = *aRangesRef;
 
                     OUString aUndo = ScGlobal::GetRscString( bShowNote ? STR_UNDO_SHOWNOTE : STR_UNDO_HIDENOTE );
                     pData->GetDocShell()->GetUndoManager()->EnterListAction( aUndo, aUndo, 0, pData->GetViewShell()->GetViewShellId() );
 
-                    for ( size_t i = 0; i < nRangeSize; ++i )
+                    for (auto const& rTab : rMark.GetSelectedTabs())
                     {
-                        const ScRange & rRange = aRanges[i];
-                        const SCROW nRow0 = rRange.aStart.Row();
-                        const SCROW nRow1 = rRange.aEnd.Row();
-                        const SCCOL nCol0 = rRange.aStart.Col();
-                        const SCCOL nCol1 = rRange.aEnd.Col();
-                        const SCTAB nRangeTab = rRange.aStart.Tab();
-                        // Check by each cell
-                        for ( SCROW nRow = nRow0; nRow <= nRow1; ++nRow )
+                        // get notes
+                        std::vector<sc::NoteEntry> aNotes;
+                        pDoc->GetAllNoteEntries(rTab, aNotes);
+
+                        for (const sc::NoteEntry& rNote : aNotes)
                         {
-                            for ( SCCOL nCol = nCol0; nCol <= nCol1; ++nCol )
+                            // check if note is in our selection range
+                            const ScAddress& rAdr = rNote.maPos;
+                            const ScRange* rRange = aRanges.Find(rAdr);
+                            if (! rRange)
+                                continue;
+
+                            // check if cell is editable
+                            const SCTAB nRangeTab = rRange->aStart.Tab();
+                            if (pDoc->IsBlockEditable( nRangeTab, rAdr.Col(), rAdr.Row(), rAdr.Col(), rAdr.Row() ))
                             {
-                                if ( pDoc->HasNote(nCol, nRow, nRangeTab) && pDoc->IsBlockEditable( nRangeTab, nCol,nRow, nCol,nRow ) )
-                                {
-                                    ScAddress aPos( nCol, nRow, nRangeTab );
-                                    pData->GetDocShell()->GetDocFunc().ShowNote( aPos, bShowNote );
-                                    bDone = true;
-                                }
+                                pData->GetDocShell()->GetDocFunc().ShowNote( rAdr, bShowNote );
+                                bDone = true;
                             }
                         }
                     }
@@ -2341,10 +2341,9 @@ void ScCellShell::ExecuteEdit( SfxRequest& rReq )
                      pDoc->GetAllNoteEntries(rTab, aNotes);
                  }
 
-                 for(std::vector<sc::NoteEntry>::const_iterator itr = aNotes.begin(),
-                     itrEnd = aNotes.end(); itr != itrEnd; ++itr)
+                 for (const sc::NoteEntry& rNote : aNotes)
                  {
-                     const ScAddress& rAdr = itr->maPos;
+                     const ScAddress& rAdr = rNote.maPos;
                      pData->GetDocShell()->GetDocFunc().ShowNote( rAdr, bShowNote );
                  }