ci: Fix gst-full breakage due to typos

This broke in 81bdef0150df3306136137a5187dc25a7c5f4aee. Simplify
removal of the plugin from the plugin list if features are listed, and
fix invocation of the script -- it was adding an extra space before
the first plugin filename.

Also ensure that gst-full CI is run when the script changes.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9452>

.gitlab-ci.yml

@@ -803,6 +803,14 @@ gstreamer-full static build:
   script:
   - $CI_PROJECT_DIR/ci/scripts/build.sh build/
   - meson test -C build -v test-gst-full
+  rules:
+    - !reference [.upstream-branch-rules, rules]
+    - changes:
+        paths:
+          *modules_changes
+    - changes:
+        paths:
+          - "scripts/generate_init_static_plugins.py"
 
 gstreamer-full-minimal static build:
   extends: 'gstreamer-full static build'

meson.build

@@ -419,12 +419,12 @@ if building_full
   init_static_plugins_c = configure_file(
     output: 'gstinitstaticplugins.c',
     command : [generate_init_static_plugins,
-               '-o ' + '@OUTPUT@',
-               '-p ' + all_plugin_names,
-               '-e ' + get_option('gst-full-elements'),
-               '-t ' + get_option('gst-full-typefind-functions'),
-               '-d ' + get_option('gst-full-device-providers'),
-               '-T ' + get_option('gst-full-dynamic-types'),
+               '-o', '@OUTPUT@',
+               '-p', all_plugin_names,
+               '-e', get_option('gst-full-elements'),
+               '-t', get_option('gst-full-typefind-functions'),
+               '-d', get_option('gst-full-device-providers'),
+               '-T', get_option('gst-full-dynamic-types'),
                '--giomodules', ';'.join(giomodules),
                ]
   )

scripts/generate_init_static_plugins.py

@@ -48,14 +48,6 @@ gst_init_static_plugins (void)
 ''')
 
 
-# Retrieve the plugin name as it can be a plugin filename
-# Retrieve the plugin name as it can be a plugin filename
-def get_plugin_name(name):
-    if name in plugins or f'libgst{name}.a' in plugins:
-        return name
-    return None
-
-
 def process_features(features_list, plugins, feature_prefix):
     plugins_list = plugins
     feature_declaration = []
@@ -66,8 +58,13 @@ def process_features(features_list, plugins, feature_prefix):
             split = plugin.split(':')
             plugin_name = split[0].strip()
             if len(split) == 2:
-                if get_plugin_name(plugin_name) is not None:
-                    plugins_list.remove(get_plugin_name(plugin_name))
+                if plugin_name in plugins_list:
+                    plugins_list.remove(plugin_name)
+                else:
+                    # The plugin name can be a filename
+                    fname = f'libgst{plugin_name}.a'
+                    if fname in plugins_list:
+                        plugins_list.remove(fname)
                 features = split[1].split(',')
                 for feature in features:
                     feature = feature.replace("-", "_")