fix: omit diff explorer footer and reclaim its row

TODO.md

@@ -4,8 +4,9 @@
 - [x] add panes/splits: split current pane above/below (`_`) or left/right (`|`) in Normal mode; navigate panes with Option/Alt+h/j/k/l.
     - shared split layout and directional focus with diff views; independent pane views, shared buffers, and guarded close/force-close actions.
 - [x] remove diff viewer's file explorer's `A added M modified...` explanation - it's standard and the explanation doesn't fit in the pane, so it can go.
-- [ ] add tabs: tab support, editor action to open a buffer in a new tab, default tab navigation is `ctrl+option+h/l`, close tab action.
+    - no replacement help footer in diff file lists; reclaim its row for file entries.
 - [ ] diff view: add character-wise change highlight (enabled by default).
+- [ ] add tabs: tab support, editor action to open a buffer in a new tab, default tab navigation is `ctrl+option+h/l`, close tab action.
 - [ ] diff view: lsp actions should act as they normally would. if an lsp action would open another file, then the file should be opened in another tab outside the diff view - if the referenced file/symbol is part of the changes in the diff, it should just be opened in the diff view.
     - this will require tab support.
 - [ ] diff view: change diff view modes; choose between split and unified diff view (split by default).

src/tui.rs

@@ -3395,7 +3395,7 @@ fn draw_file_list(
     }
     let show_root = content.height >= 4 && !picker.root.as_os_str().is_empty();
     let show_error = picker.error.is_some() && content.height >= 2;
-    let show_help = content.height >= 5 + u16::from(show_error);
+    let show_help = changed_files.is_none() && content.height >= 5 + u16::from(show_error);
     let root = show_root.then(|| {
         Paragraph::new(display_text(&picker.root.to_string_lossy()))
             .style(Style::default().fg(Color::DarkGray))
@@ -3550,27 +3550,18 @@ fn draw_file_list(
             ));
         }
     }
+    if !show_help {
+        return;
+    }
     let help = if picker.focused {
-        let controls = if changed_files.is_some() {
+        let controls = match (picker.presentation, browsing) {
-            if browsing {
-                "Enter · i filter · Esc close · Tab panes · ^T view"
-            } else {
-                "Enter · Esc · Tab panes · ^T view"
-            }
-        } else {
-            match (picker.presentation, browsing) {
             (FilePresentation::Floating, true) => "Enter · i filter · Esc/^W close · ^R · ^T",
-                (FilePresentation::Docked, true) => {
+            (FilePresentation::Docked, true) => "Enter · i filter · Esc/Tab edit · ^W · ^R · ^T",
-                    "Enter · i filter · Esc/Tab edit · ^W · ^R · ^T"
-                }
             (_, false) if picker.view == FileView::Tree => "Enter · Esc NORMAL · ^W · ^R · ^T",
             (FilePresentation::Floating, false) => "Enter · Esc/^W close · ^R · ^T",
             (FilePresentation::Docked, false) => "Enter · Esc/Tab edit · ^W · ^R · ^T",
-            }
         };
         format!("^U clear · {navigation_hint} · {controls}")
-    } else if changed_files.is_some() {
-        "Editor focus · Tab to browse changed files".into()
     } else {
         "Editor focus · invoke explorer to browse".into()
     };