DIAGNOSTIC: turn off labels/legend/grid/axes in chart-line

Trying to narrow down which XYChart.draw subpath is making chart-line
render blank on iOS GL+Metal. With ShowLabels/ShowLegend/ShowGrid/
ShowAxes all disabled the chart paints only the data series strokes
(drawPath through GeneralPath -> Graphics.drawShape). If chart-line
then captures a non-blank PNG on iOS we know drawText/drawLegend/
drawGrid/drawAxes is at fault; if it stays blank, drawSeries' drawPath
is the suspect. This commit is purely diagnostic and will be reverted
once the culprit is identified.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: shai-almog

scripts/hellocodenameone/common/src/main/java/com/codenameone/examples/hellocodenameone/tests/charts/ChartLineScreenshotTest.java

@@ -40,8 +40,20 @@ protected AbstractChart buildChart() {
         renderer.setAxisTitleTextSize(20);
         renderer.setLegendTextSize(20);
         renderer.setMargins(new int[]{36, 60, 24, 24});
-        renderer.setXTitle("Year");
-        renderer.setYTitle("Value");
+        // Diagnostic: turn off labels + legend + grid + axes so XYChart.draw
+        // paints essentially nothing beyond drawSeries (the line strokes).
+        // If chart-line renders an empty white form on iOS GL/Metal under
+        // this minimal config we know the form / paint pipeline is working
+        // and the bug is in one of the disabled code paths
+        // (drawText / drawLegend / drawGrid / drawAxes). If it stays blank
+        // even with everything off, something fundamental about XYChart's
+        // first paint is breaking iOS rendering.
+        renderer.setShowLabels(false);
+        renderer.setShowLegend(false);
+        renderer.setShowGrid(false);
+        renderer.setShowAxes(false);
+        // renderer.setXTitle("Year");
+        // renderer.setYTitle("Value");
         renderer.setXLabels(5);
         renderer.setYLabels(5);
         renderer.setShowGrid(true);