fix(compatibility): handle inserting characters after wide character (#…

…964)

* fix(compatibility): handle inserting characters in the middle of a line after a wide character

* style(fmt): make rustfmt happy

src/tests/fixtures/wide_characters_middle_line_insert

@@ -0,0 +1 @@
+[?2004h[aram@green zellij]$ [aram@green zellij]$ 🏠🏠 abcdabceabcfabc abc[1@x

zellij-server/src/panes/grid.rs

@@ -2249,14 +2249,17 @@ impl Row {
         }
     }
     pub fn insert_character_at(&mut self, terminal_character: TerminalCharacter, x: usize) {
-        match self.columns.len().cmp(&x) {
+        let width_offset = self.excess_width_until(x);
+        let insert_position = x.saturating_sub(width_offset);
+        match self.columns.len().cmp(&insert_position) {
             Ordering::Equal => self.columns.push_back(terminal_character),
             Ordering::Less => {
-                self.columns.resize(x, EMPTY_TERMINAL_CHARACTER);
+                self.columns
+                    .resize(insert_position, EMPTY_TERMINAL_CHARACTER);
                 self.columns.push_back(terminal_character);
             }
             Ordering::Greater => {
-                self.columns.insert(x, terminal_character);
+                self.columns.insert(insert_position, terminal_character);
             }
         }
     }

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

@@ -420,6 +420,18 @@ fn wide_characters_line_wrap() {
     assert_snapshot!(format!("{:?}", grid));
 }
 
+#[test]
+fn insert_character_in_line_with_wide_character() {
+    let mut vte_parser = vte::Parser::new();
+    let mut grid = Grid::new(21, 104, Palette::default());
+    let fixture_name = "wide_characters_middle_line_insert";
+    let content = read_fixture(fixture_name);
+    for byte in content {
+        vte_parser.advance(&mut grid, byte);
+    }
+    assert_snapshot!(format!("{:?}", grid));
+}
+
 #[test]
 fn fish_wide_characters_override_clock() {
     let mut vte_parser = vte::Parser::new();

zellij-server/src/panes/unit/snapshots/zellij_server__panes__grid__grid_tests__insert_character_in_line_with_wide_character.snap

@@ -0,0 +1,7 @@
+---
+source: zellij-server/src/panes/./unit/grid_tests.rs
+expression: "format!(\"{:?}\", grid)"
+
+---
+00 (C): [aram@green zellij]$ 🏠 xdef abc                                                                        
+