Fix: Preserve base marker styles when updating selected marker parameters

	* [FIX] : Update MarkerParam.update_param to read back the selected or unselected visual state into the matching parameter set instead of overwriting the base style with selected styles
	* [TEST] : Add a unit test in test_styles.py to verify that selected marker updates keep normal and selected style parameters distinct

Author: dappham-CODRA

plotpy/styles/shape.py

@@ -81,9 +81,20 @@ def update_param(self, obj: Marker) -> None:
         self.symbol: SymbolParam
         self.text: TextStyleParam
         self.line: LineStyleParam
-        self.symbol.update_param(obj.symbol())
-        self.text.update_param(obj.label())
-        self.line.update_param(obj.linePen())
+        self.sel_symbol: SymbolParam
+        self.sel_text: TextStyleParam
+        self.sel_line: LineStyleParam
+        if obj.selected:
+            symbol = self.sel_symbol
+            text = self.sel_text
+            line = self.sel_line
+        else:
+            symbol = self.symbol
+            text = self.text
+            line = self.line
+        symbol.update_param(obj.symbol())
+        text.update_param(obj.label())
+        line.update_param(obj.linePen())
         self.markerstyle = MARKERSTYLE_NAME[obj.lineStyle()]
         self.spacing = obj.spacing()
 

plotpy/tests/unit/test_styles.py

@@ -13,7 +13,9 @@
 from qwt import QwtSymbol
 
 from plotpy.config import UserConfig, _
+from plotpy.items import Marker
 from plotpy.styles.base import LineStyleParam, SymbolParam
+from plotpy.styles.shape import MarkerParam
 
 gettext.install("test")
 CONF = UserConfig({})
@@ -77,6 +79,28 @@ def test_update(self):
         self.assertEqual(ls.style, "SolidLine")
         self.assertEqual(ls.color, "#ff0000")
 
+
+class TestMarkerParam(unittest.TestCase):
+    def test_update_param_preserves_unselected_style_when_selected(self):
+        param = MarkerParam(_("Marker"))
+        param.line.color = "#ff0000"
+        param.symbol.facecolor = "#ffff00"
+        param.text.textcolor = "#0000ff"
+        param.sel_line.color = "#00ff00"
+        param.sel_symbol.facecolor = "#00ffff"
+        param.sel_text.textcolor = "#ff00ff"
+        marker = Marker(markerparam=param)
+
+        marker.select()
+        marker.update_item_parameters()
+
+        self.assertEqual(marker.markerparam.line.color, "#ff0000")
+        self.assertEqual(marker.markerparam.symbol.facecolor, "#ffff00")
+        self.assertEqual(marker.markerparam.text.textcolor, "#0000ff")
+        self.assertEqual(marker.markerparam.sel_line.color, "#00ff00")
+        self.assertEqual(marker.markerparam.sel_symbol.facecolor, "#00ffff")
+        self.assertEqual(marker.markerparam.sel_text.textcolor, "#ff00ff")
+
     def test_saveconfig(self):
         ls = LineStyleParam(_("Line style"))
         ls.write_config(CONF, "ls", "")