Keymap: 'M' for edit-mesh merge menu, 'Alt-M' for split menu

As the 'M' key is free, it's convenient to use for the merge menu,
especially since this contains "Merge by Distance",
a frequently used action.

Use 'Alt-M' for a new split menu, following our convention of Alt being
used for opposite functionality.

Also move merge/split menu's into the "Mesh" menu as neither operate
solely on a single mesh element type.

2 files changed, 24 insertions, 7 deletions

diff --git a/release/scripts/presets/keyconfig/keymap_data/blender_default.py b/release/scripts/presets/keyconfig/keymap_data/blender_default.py
index 54936bf1fde..22b62d27684 100644
--- a/release/scripts/presets/keyconfig/keymap_data/blender_default.py
+++ b/release/scripts/presets/keyconfig/keymap_data/blender_default.py
@@ -4456,7 +4456,8 @@ def km_mesh(params):
         ("mesh.rip_move", {"type": 'V', "value": 'PRESS', "alt": True},
          {"properties": [("MESH_OT_rip", [("use_fill", True), ],)]}),
         ("mesh.rip_edge_move", {"type": 'D', "value": 'PRESS', "alt": True}, None),
-        op_menu("VIEW3D_MT_edit_mesh_merge", {"type": 'M', "value": 'PRESS', "alt": True}),
+        op_menu("VIEW3D_MT_edit_mesh_merge", {"type": 'M', "value": 'PRESS'}),
+        op_menu("VIEW3D_MT_edit_mesh_split", {"type": 'M', "value": 'PRESS', "alt": True}),
         ("transform.shrink_fatten", {"type": 'S', "value": 'PRESS', "alt": True, "repeat": False}, None),
         ("mesh.edge_face_add", {"type": 'F', "value": 'PRESS'}, None),
         ("mesh.duplicate_move", {"type": 'D', "value": 'PRESS', "shift": True}, None),
diff --git a/release/scripts/startup/bl_ui/space_view3d.py b/release/scripts/startup/bl_ui/space_view3d.py
index 142175ace51..7a33a244758 100644
--- a/release/scripts/startup/bl_ui/space_view3d.py
+++ b/release/scripts/startup/bl_ui/space_view3d.py
@@ -3612,7 +3612,14 @@ class VIEW3D_MT_edit_mesh(Menu):
 
         layout.operator("mesh.duplicate_move", text="Duplicate")
         layout.menu("VIEW3D_MT_edit_mesh_extrude")
-        layout.operator("mesh.split")
+
+        layout.separator()
+
+        layout.menu("VIEW3D_MT_edit_mesh_merge", text="Merge")
+        layout.menu("VIEW3D_MT_edit_mesh_split", text="Split")
+
+        layout.separator()
+
         layout.operator("mesh.bisect")
         layout.operator("mesh.knife_project")
 
@@ -3942,10 +3949,6 @@ class VIEW3D_MT_edit_mesh_vertices(Menu):
 
         layout.separator()
 
-        layout.menu("VIEW3D_MT_edit_mesh_merge", text="Merge Vertices")
-
-        layout.separator()
-
         layout.menu("VIEW3D_MT_vertex_group")
         layout.menu("VIEW3D_MT_hook")
 
@@ -4018,7 +4021,6 @@ class VIEW3D_MT_edit_mesh_edges(Menu):
         layout.separator()
 
         layout.operator("transform.edge_slide")
-        layout.operator("mesh.edge_split")
 
         layout.separator()
 
@@ -4296,6 +4298,19 @@ class VIEW3D_MT_edit_mesh_merge(Menu):
         layout.operator("mesh.remove_doubles", text="By Distance")
 
 
+class VIEW3D_MT_edit_mesh_split(Menu):
+    bl_label = "Split"
+
+    def draw(self, _context):
+        layout = self.layout
+
+        layout.operator("mesh.split", text="Selection")
+
+        layout.separator()
+
+        layout.operator_enum("mesh.edge_split", "type")
+
+
 class VIEW3D_MT_edit_mesh_showhide(ShowHideMenu, Menu):
     _operator_name = "mesh"
 
@@ -7419,6 +7434,7 @@ classes = (
     VIEW3D_MT_edit_mesh_clean,
     VIEW3D_MT_edit_mesh_delete,
     VIEW3D_MT_edit_mesh_merge,
+    VIEW3D_MT_edit_mesh_split,
     VIEW3D_MT_edit_mesh_showhide,
     VIEW3D_MT_paint_gpencil,
     VIEW3D_MT_assign_material,