From ae1b08b8185b6fabc8ea942959fd6431c45a4e9c Mon Sep 17 00:00:00 2001
From: aleichter <andrew.leichter@epsoftinc.com>
Date: Fri, 29 Dec 2023 21:14:05 -0500
Subject: [PATCH 1/2] Added functionality to teat holding the shift key and
 selecting From Facemap as an additive select

---
 facemap_select.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/facemap_select.py b/facemap_select.py
index d7baf3a..98d2bbd 100644
--- a/facemap_select.py
+++ b/facemap_select.py
@@ -56,7 +56,8 @@ def poll(self, context):
         )
 
     def execute(self, context):
-        bpy.ops.mesh.select_all(action="DESELECT")
+        if not self.__shift:
+            bpy.ops.mesh.select_all(action="DESELECT")
         attribute_name = context.active_object.data.attributes.active.name
         bpy.ops.object.editmode_toggle()
         for polygon, facemap_attribute in zip(
@@ -66,7 +67,10 @@ def execute(self, context):
             polygon.select = facemap_attribute.value
         bpy.ops.object.editmode_toggle()
         return {"FINISHED"}
-
+    
+    def invoke(self, context, event):
+        self.__shift = event.shift
+        return self.execute(context)
 
 class FacemapCreate(bpy.types.Operator):
     bl_idname = "mesh.facemap_create"

From b320ed5cb875c81a97de02c8b8154d79b2250c4f Mon Sep 17 00:00:00 2001
From: varkenvarken <andersmichel8@gmail.com>
Date: Sat, 30 Dec 2023 14:12:19 +0100
Subject: [PATCH 2/2] merged PR from aleichter

---
 facemap_select.py | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/facemap_select.py b/facemap_select.py
index 98d2bbd..72266ef 100644
--- a/facemap_select.py
+++ b/facemap_select.py
@@ -26,8 +26,8 @@
 
 bl_info = {
     "name": "FacemapSelect",
-    "author": "Michel Anders (varkenvarken)",
-    "version": (0, 0, 20231014152157),
+    "author": "Michel Anders (varkenvarken) with contribution from Andrew Leichter (aleichter)",
+    "version": (0, 0, 20231230140402),
     "blender": (4, 0, 0),
     "location": "Edit mode 3d-view, Select- -> From facemap | Create facemap",
     "description": "Select faces based on the active boolean facemap or create a new facemap",
@@ -39,10 +39,13 @@
 
 import bpy
 
+
 class FacemapSelect(bpy.types.Operator):
     bl_idname = "mesh.facemap_select"
     bl_label = "FacemapSelect"
-    bl_description = "Select faces based on active facemap"
+    bl_description = (
+        "Select faces based on active facemap (+ Shift add to current selection)"
+    )
     bl_options = {"REGISTER", "UNDO"}
 
     @classmethod
@@ -64,18 +67,23 @@ def execute(self, context):
             context.active_object.data.polygons,
             context.active_object.data.attributes[attribute_name].data,
         ):
-            polygon.select = facemap_attribute.value
+            polygon.select |= (
+                facemap_attribute.value
+            )  # keeps polygons selected that already were
         bpy.ops.object.editmode_toggle()
         return {"FINISHED"}
-    
+
     def invoke(self, context, event):
         self.__shift = event.shift
         return self.execute(context)
 
+
 class FacemapCreate(bpy.types.Operator):
     bl_idname = "mesh.facemap_create"
     bl_label = "FacemapCreate"
-    bl_description = "Create a new boolean face map and set value according to current selection"
+    bl_description = (
+        "Create a new boolean face map and set value according to current selection"
+    )
     bl_options = {"REGISTER", "UNDO"}
 
     @classmethod