Prevent scrollbar from covering bottom right text in terminal (#33636)

Closes https://github.com/zed-industries/zed/issues/27241

Release Notes:

- Fixed terminal scrollbar covering bottom right text by adding proper
content padding when scrollbar is visible

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/terminal_view/src/terminal_view.rs

@@ -64,8 +64,8 @@ use std::{
 };
 
 const CURSOR_BLINK_INTERVAL: Duration = Duration::from_millis(500);
-
 const GIT_DIFF_PATH_PREFIXES: &[&str] = &["a", "b"];
+const TERMINAL_SCROLLBAR_WIDTH: Pixels = px(12.);
 
 /// Event to transmit the scroll from the element to the view
 #[derive(Clone, Debug, PartialEq)]
@@ -956,13 +956,12 @@ impl TerminalView {
                 .on_scroll_wheel(cx.listener(|_, _, _window, cx| {
                     cx.notify();
                 }))
-                .h_full()
                 .absolute()
-                .right_1()
+                .top_0()
-                .top_1()
                 .bottom_0()
-                .w(px(12.))
+                .right_0()
-                .cursor_default()
+                .h_full()
+                .w(TERMINAL_SCROLLBAR_WIDTH)
                 .children(Scrollbar::vertical(self.scrollbar_state.clone())),
         )
     }
@@ -1496,6 +1495,16 @@ impl Render for TerminalView {
 
         let focused = self.focus_handle.is_focused(window);
 
+        // Always calculate scrollbar width to prevent layout shift
+        let scrollbar_width = if Self::should_show_scrollbar(cx)
+            && self.content_mode(window, cx).is_scrollable()
+            && self.terminal.read(cx).total_lines() > self.terminal.read(cx).viewport_lines()
+        {
+            TERMINAL_SCROLLBAR_WIDTH
+        } else {
+            px(0.)
+        };
+
         div()
             .id("terminal-view")
             .size_full()
@@ -1545,6 +1554,8 @@ impl Render for TerminalView {
                 // TODO: Oddly this wrapper div is needed for TerminalElement to not steal events from the context menu
                 div()
                     .size_full()
+                    .bg(cx.theme().colors().editor_background)
+                    .when(scrollbar_width > px(0.), |div| div.pr(scrollbar_width))
                     .child(TerminalElement::new(
                         terminal_handle,
                         terminal_view_handle,