Apply show_completions_on_input: false to word & snippet completions (#44021)

Closes #43408

Previously, we checked the setting inside `is_completion_trigger()`,
which only affects LSP completions. This was ok because user-defined
snippets were tacked onto LSP completions. Then #42122 and #42398 made
snippet completions their own thing, similar to word completions,
surfacing #43408. This PR moves the settings check into
`open_or_update_completions_menu()` so it applies to all completions.

Release Notes:

- Fixed setting `show_completions_on_input: false` so that it affects
word and user-defined snippet completions as well as LSP completions

crates/agent_ui/src/completion_provider.rs

@@ -1114,7 +1114,6 @@ impl<T: PromptCompletionProviderDelegate> CompletionProvider for PromptCompletio
         position: language::Anchor,
         _text: &str,
         _trigger_in_words: bool,
-        _menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool {
         let buffer = buffer.read(cx);

crates/agent_ui/src/slash_command.rs

@@ -341,7 +341,6 @@ impl CompletionProvider for SlashCommandCompletionProvider {
         position: language::Anchor,
         _text: &str,
         _trigger_in_words: bool,
-        _menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool {
         let buffer = buffer.read(cx);

crates/debugger_ui/src/session/running/console.rs

@@ -559,7 +559,6 @@ impl CompletionProvider for ConsoleQueryBarCompletionProvider {
         position: language::Anchor,
         text: &str,
         trigger_in_words: bool,
-        menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool {
         let mut chars = text.chars();
@@ -570,9 +569,6 @@ impl CompletionProvider for ConsoleQueryBarCompletionProvider {
         };
 
         let snapshot = buffer.read(cx).snapshot();
-        if !menu_is_open && !snapshot.settings_at(position, cx).show_completions_on_input {
-            return false;
-        }
 
         let classifier = snapshot
             .char_classifier_at(position)

crates/editor/src/editor.rs

@@ -5509,6 +5509,22 @@ impl Editor {
         };
         let buffer_snapshot = buffer.read(cx).snapshot();
 
+        let menu_is_open = matches!(
+            self.context_menu.borrow().as_ref(),
+            Some(CodeContextMenu::Completions(_))
+        );
+
+        let language = buffer_snapshot
+            .language_at(buffer_position.text_anchor)
+            .map(|language| language.name());
+
+        let language_settings = language_settings(language.clone(), buffer_snapshot.file(), cx);
+        let completion_settings = language_settings.completions.clone();
+
+        if !menu_is_open && trigger.is_some() && !language_settings.show_completions_on_input {
+            return;
+        }
+
         let query: Option<Arc<String>> =
             Self::completion_query(&multibuffer_snapshot, buffer_position)
                 .map(|query| query.into());
@@ -5517,14 +5533,8 @@ impl Editor {
 
         // Hide the current completions menu when query is empty. Without this, cached
         // completions from before the trigger char may be reused (#32774).
-        if query.is_none() {
-            let menu_is_open = matches!(
-                self.context_menu.borrow().as_ref(),
-                Some(CodeContextMenu::Completions(_))
-            );
-            if menu_is_open {
-                self.hide_context_menu(window, cx);
-            }
+        if query.is_none() && menu_is_open {
+            self.hide_context_menu(window, cx);
         }
 
         let mut ignore_word_threshold = false;
@@ -5613,14 +5623,6 @@ impl Editor {
             (buffer_position..buffer_position, None)
         };
 
-        let language = buffer_snapshot
-            .language_at(buffer_position)
-            .map(|language| language.name());
-
-        let completion_settings = language_settings(language.clone(), buffer_snapshot.file(), cx)
-            .completions
-            .clone();
-
         let show_completion_documentation = buffer_snapshot
             .settings_at(buffer_position, cx)
             .show_completion_documentation;
@@ -5651,7 +5653,6 @@ impl Editor {
                     position.text_anchor,
                     trigger,
                     trigger_in_words,
-                    completions_source.is_some(),
                     cx,
                 )
             })
@@ -23486,7 +23487,6 @@ pub trait CompletionProvider {
         position: language::Anchor,
         text: &str,
         trigger_in_words: bool,
-        menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool;
 
@@ -23865,7 +23865,6 @@ impl CompletionProvider for Entity<Project> {
         position: language::Anchor,
         text: &str,
         trigger_in_words: bool,
-        menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool {
         let mut chars = text.chars();
@@ -23880,9 +23879,6 @@ impl CompletionProvider for Entity<Project> {
 
         let buffer = buffer.read(cx);
         let snapshot = buffer.snapshot();
-        if !menu_is_open && !snapshot.settings_at(position, cx).show_completions_on_input {
-            return false;
-        }
         let classifier = snapshot
             .char_classifier_at(position)
             .scope_context(Some(CharScopeContext::Completion));

crates/inspector_ui/src/div_inspector.rs

@@ -686,7 +686,6 @@ impl CompletionProvider for RustStyleCompletionProvider {
         position: language::Anchor,
         _text: &str,
         _trigger_in_words: bool,
-        _menu_is_open: bool,
         cx: &mut Context<Editor>,
     ) -> bool {
         completion_replace_range(&buffer.read(cx).snapshot(), &position).is_some()

crates/keymap_editor/src/keymap_editor.rs

@@ -3001,7 +3001,6 @@ impl CompletionProvider for KeyContextCompletionProvider {
         _position: language::Anchor,
         text: &str,
         _trigger_in_words: bool,
-        _menu_is_open: bool,
         _cx: &mut Context<Editor>,
     ) -> bool {
         text.chars()