UI: Add Extrude Manifold Icon

Differential Revision: https://developer.blender.org/D8016

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -821,7 +821,7 @@ class _defs_edit_mesh:
             description=(
                 "Extrude, dissolves edges whose faces form a flat surface and intersect new edges"
             ),
-            icon="none",
+            icon="ops.mesh.extrude_manifold",
             widget="VIEW3D_GGT_tool_generic_handle_normal",
             keymap=(),
         )

source/blender/editors/datafiles/CMakeLists.txt

@@ -713,6 +713,7 @@ set_property(GLOBAL PROPERTY ICON_GEOM_NAMES
   ops.mesh.bisect
   ops.mesh.dupli_extrude_cursor
   ops.mesh.extrude_faces_move
+  ops.mesh.extrude_manifold
   ops.mesh.extrude_region_move
   ops.mesh.extrude_region_shrink_fatten
   ops.mesh.inset