osm-vector-maps/README.md & osm_vector_maps_enabled experiment for IIAB 7.2 RC2

roles/osm-vector-maps/tasks/install.yml

@@ -192,7 +192,8 @@
     - iiab-make-init.py
     - iiab-update-map
 
-# nginx.yml handles this, right?
+# nginx.yml handles this.  Please see discussion/question in tasks/nginx.yml
+#
 #- name: Install /etc/nginx/osm-vector-maps-nginx.conf from template
 #  template:
 #    src: osm-vector-maps-nginx.conf.j2

roles/osm-vector-maps/tasks/main.yml

@@ -18,7 +18,7 @@
 
 - name: Enable/Disable/Reload NGINX for OSM, if nginx_enabled
   include_tasks: nginx.yml
-  #when: nginx_enabled | bool
+  #when: nginx_enabled | bool    # NGINX is mandatory starting with IIAB 7.2
 
 
 - name: Add 'osm-vector-maps' variable values to {{ iiab_ini_file }}

roles/osm-vector-maps/tasks/nginx.yml

@@ -2,14 +2,26 @@
   template:
     src: osm-vector-maps-nginx.conf.j2
     dest: "{{ nginx_conf_dir }}/osm-vector-maps-nginx.conf"    # /etc/nginx/conf.d
-  when: osm_vector_maps_install | bool
+  when: osm_vector_maps_enabled | bool
+  #when: osm_vector_maps_install | bool
+
 # Note that the above change from enabled->install is required by the OSM command line installer
 
+# 2020-09-29: @georgejhunt can u explain more the PR #2486 comment just above ?
+#
+# osm_vector_maps_install is _always_ true here, so doesn't serve a purpose in
+# when: conditions.  What underlying issue are we trying to solve?  If this is
+# to enable a functioning world map to zoom level 7-or-10, can we be honest in
+# saying "enablement" IS essentially required...in most/all situations?  @holta
+#
+# SEE: #2484, PR #2486, #2487 mentioned @ roles/osm-vector-maps/README.md
+
 - name: Disable http://box/maps & http://box/osm-vector-maps via NGINX, by removing {{ nginx_conf_dir }}/osm-vector-maps-nginx.conf
   file:
     path: "{{ nginx_conf_dir }}/osm-vector-maps-nginx.conf"    # /etc/nginx/conf.d
     state: absent
-  when: not osm_vector_maps_install
+  when: not osm_vector_maps_enabled
+  #when: not osm_vector_maps_install
 
 - name: Reload 'nginx' systemd service
   systemd: