fix(terminal): persist cursor hide/show through alternate screen (#1586)

* fix(terminal): persist cursor hide/show through alternate screen

* style(fmt): rustfmt

* style(clippy): make clippy happy

zellij-server/src/panes/grid.rs

@@ -305,6 +305,7 @@ pub struct Grid {
     horizontal_tabstops: BTreeSet<usize>,
     alternate_screen_state: Option<AlternateScreenState>,
     cursor: Cursor,
+    cursor_is_hidden: bool,
     saved_cursor_position: Option<Cursor>,
     // FIXME: change scroll_region to be (usize, usize) - where the top line is always the first
     // line of the viewport and the bottom line the last unless it's changed with CSI r and friends
@@ -408,6 +409,7 @@ impl Grid {
             lines_below: vec![],
             horizontal_tabstops: create_horizontal_tabstops(columns),
             cursor: Cursor::new(0, 0),
+            cursor_is_hidden: false,
             saved_cursor_position: None,
             scroll_region: None,
             preceding_char: None,
@@ -898,7 +900,7 @@ impl Grid {
         (changed_character_chunks, changed_sixel_image_chunks)
     }
     pub fn cursor_coordinates(&self) -> Option<(usize, usize)> {
-        if self.cursor.is_hidden {
+        if self.cursor_is_hidden {
             None
         } else {
             Some((self.cursor.x, self.cursor.y))
@@ -1309,10 +1311,10 @@ impl Grid {
         }
     }
     pub fn hide_cursor(&mut self) {
-        self.cursor.is_hidden = true;
+        self.cursor_is_hidden = true;
     }
     pub fn show_cursor(&mut self) {
-        self.cursor.is_hidden = false;
+        self.cursor_is_hidden = false;
     }
     pub fn set_scroll_region(&mut self, top_line_index: usize, bottom_line_index: Option<usize>) {
         let bottom_line_index = bottom_line_index.unwrap_or(self.height);

zellij-server/src/panes/terminal_character.rs

@@ -672,7 +672,6 @@ pub enum CursorShape {
 pub struct Cursor {
     pub x: usize,
     pub y: usize,
-    pub is_hidden: bool,
     pub pending_styles: CharacterStyles,
     pub charsets: Charsets,
     shape: CursorShape,
@@ -683,7 +682,6 @@ impl Cursor {
         Cursor {
             x,
             y,
-            is_hidden: false,
             pending_styles: RESET_STYLES,
             charsets: Default::default(),
             shape: CursorShape::Initial,

zellij-server/src/panes/unit/grid_tests.rs

@@ -2513,3 +2513,54 @@ pub fn xtsmgraphics_pixel_graphics_geometry() {
         });
     assert_eq!(message_string, "\u{1b}[?2;0;776;1071S");
 }
+
+#[test]
+pub fn cursor_hide_persists_through_alternate_screen() {
+    let mut vte_parser = vte::Parser::new();
+    let sixel_image_store = Rc::new(RefCell::new(SixelImageStore::default()));
+    let terminal_emulator_color_codes = Rc::new(RefCell::new(HashMap::new()));
+    let character_cell_size = Rc::new(RefCell::new(Some(SizeInPixels {
+        width: 8,
+        height: 21,
+    })));
+    let mut grid = Grid::new(
+        30,
+        112,
+        Rc::new(RefCell::new(Palette::default())),
+        terminal_emulator_color_codes,
+        Rc::new(RefCell::new(LinkHandler::new())),
+        character_cell_size,
+        sixel_image_store,
+    );
+
+    let hide_cursor = "\u{1b}[?25l";
+    for byte in hide_cursor.as_bytes() {
+        vte_parser.advance(&mut grid, *byte);
+    }
+    assert_eq!(grid.cursor_coordinates(), None, "Cursor hidden properly");
+
+    let move_to_alternate_screen = "\u{1b}[?1049h";
+    for byte in move_to_alternate_screen.as_bytes() {
+        vte_parser.advance(&mut grid, *byte);
+    }
+    assert_eq!(
+        grid.cursor_coordinates(),
+        None,
+        "Cursor still hidden in alternate screen"
+    );
+
+    let show_cursor = "\u{1b}[?25h";
+    for byte in show_cursor.as_bytes() {
+        vte_parser.advance(&mut grid, *byte);
+    }
+    assert!(grid.cursor_coordinates().is_some(), "Cursor shown");
+
+    let move_away_from_alternate_screen = "\u{1b}[?1049l";
+    for byte in move_away_from_alternate_screen.as_bytes() {
+        vte_parser.advance(&mut grid, *byte);
+    }
+    assert!(
+        grid.cursor_coordinates().is_some(),
+        "Cursor still shown away from alternate screen"
+    );
+}