@@ -1361,6 +1361,50 @@ describe('stacked area', function() {
13611361} )
13621362. then ( done , done . fail ) ;
13631363} ) ;
1364+
1365+ it ( 'maintains correct fill elements when toggling trace visibility in stacked area charts' , function ( done ) {
1366+ // Regression test for issue #7660
1367+ // When isolating, then hiding all, then showing all traces in a stacked area chart,
1368+ // fill elements should be correctly drawn for all traces.
1369+
1370+ function countNonEmptyFills ( ) {
1371+ return d3SelectAll ( '.scatterlayer .js-fill' ) . filter ( function ( ) {
1372+ var d = d3Select ( this ) . attr ( 'd' ) ;
1373+ return d && d !== 'M0,0Z' ;
1374+ } ) . size ( ) ;
1375+ }
1376+
1377+ Plotly . newPlot ( gd , [
1378+ { x :[ 1 , 2 , 3 ] , y :[ 2 , 1 , 4 ] , stackgroup :'one' , name :'trace 0' } ,
1379+ { x :[ 1 , 2 , 3 ] , y :[ 1 , 1 , 2 ] , stackgroup :'one' , name :'trace 1' } ,
1380+ { x :[ 1 , 2 , 3 ] , y :[ 3 , 0 , 2 ] , stackgroup :'one' , name :'trace 2' }
1381+ ] )
1382+ . then ( function ( ) {
1383+ // Initially all 3 traces should be visible with fills
1384+ expect ( countNonEmptyFills ( ) ) . toBe ( 3 , 'should have 3 fill paths initially' ) ;
1385+
1386+ // Show trace 1 only
1387+ return Plotly . restyle ( gd , 'visible' , [ 'legendonly' , true , 'legendonly' ] ) ;
1388+ } )
1389+ . then ( function ( ) {
1390+ // Verify only one fill is drawn (trace 1)
1391+ expect ( countNonEmptyFills ( ) ) . toBe ( 1 , 'should have 1 fill path when isolating trace 1' ) ;
1392+ // Hide all traces
1393+ return Plotly . restyle ( gd , 'visible' , [ 'legendonly' , 'legendonly' , 'legendonly' ] ) ;
1394+ } )
1395+ . then ( function ( ) {
1396+ // Verify no fills are drawn
1397+ expect ( countNonEmptyFills ( ) ) . toBe ( 0 , 'should have 0 fill paths when hiding all traces' ) ;
1398+ // Show all traces again
1399+ return Plotly . restyle ( gd , 'visible' , [ true , true , true ] ) ;
1400+ } )
1401+ . then ( function ( ) {
1402+ // Verify all 3 fills are drawn again
1403+ // This is the step that was failing in #7660
1404+ expect ( countNonEmptyFills ( ) ) . toBe ( 3 , 'should have 3 fill paths after showing all traces again' ) ;
1405+ } )
1406+ . then ( done , done . fail ) ;
1407+ } ) ;
13641408} ) ;
13651409
13661410describe ( 'scatter hoverPoints' , function ( ) {