Switcher: Remove direct dependency on Projects

That created a special case for Projects, which is not really necessary.

spyder/plugins/projects/plugin.py

@@ -569,7 +569,8 @@ def _display_items_in_switcher(self, items, setup, clear_section):
                 section=section,
                 data=path,
                 last_item=is_last_item,
-                score=1e10  # To make the editor results appear first
+                score=1e10,  # To make the editor results appear first
+                use_score=False  # Results come from fzf in the right order
             )
 
         if setup:

spyder/plugins/switcher/plugin.py

@@ -39,7 +39,7 @@ class Switcher(SpyderPluginV2):
     """
 
     NAME = "switcher"
-    OPTIONAL = [Plugins.MainMenu, Plugins.Projects]
+    OPTIONAL = [Plugins.MainMenu]
     CONTAINER_CLASS = SwitcherContainer
     CONF_SECTION = NAME
     CONF_FILE = False
@@ -160,15 +160,6 @@ def on_main_menu_teardown(self):
                 menu_id=ApplicationMenus.File
             )
 
-    @on_plugin_available(plugin=Plugins.Projects)
-    def on_projects_available(self):
-        projects = self.get_plugin(Plugins.Projects)
-        self._switcher.projects_section = projects.get_widget().get_title()
-
-    @on_plugin_teardown(plugin=Plugins.Projects)
-    def on_projects_teardown(self):
-        self._switcher.projects_section = None
-
     # ---- Public API
     # -------------------------------------------------------------------------
     # Switcher methods

spyder/plugins/switcher/widgets/switcher.py

@@ -165,7 +165,6 @@ def __init__(self, parent, help_text=None, item_styles=ITEM_STYLES,
         self._mode_on = ''
         self._item_styles = item_styles
         self._item_separator_styles = item_separator_styles
-        self.projects_section = None
 
         # Widgets
         self.edit = QLineEdit(self)
@@ -350,10 +349,7 @@ def setup(self):
                 rich_title = rich_title.replace(" ", " ")
                 item.set_rich_title(rich_title)
 
-            # Results come from Projects in the right order, so we don't need
-            # to sort them here.
-            if item._section != self.projects_section:
-                item.set_score(score_value)
+            item.set_score(score_value)
 
         self.proxy.set_filter_by_score(True)
         self.proxy.sortBy('_score')