Fix rendering of right border with irregular columns

Closes #73.

src/app.rs

@@ -1111,6 +1111,32 @@ mod tests {
         assert_eq!(lines, expected);
     }
 
+    #[test]
+    fn test_extra_fields_right_most_border() {
+        let mut app = AppBuilder::new("tests/data/bad_73.csv").build().unwrap();
+        thread::sleep(time::Duration::from_millis(100));
+
+        let backend = TestBackend::new(35, 10);
+        let mut terminal = Terminal::new(backend).unwrap();
+
+        step_and_draw(&mut app, &mut terminal, Control::Nothing);
+        let expected = vec![
+            "───────────────────────────────────",
+            "      COL1     COL2                ",
+            "───┬───────────────────┬───────────",
+            "1  │  c1               │           ",
+            "2  │  c2       v2      │           ",
+            "3  │  c2       4       │           ",
+            "4  │  c3               │           ",
+            "5  │  c4               │           ",
+            "───┴───────────────────┴───────────",
+            "stdin [Row 1/13, Col 1/2]          ",
+        ];
+        let actual_buffer = terminal.backend().buffer().clone();
+        let lines = to_lines(&actual_buffer);
+        assert_eq!(lines, expected);
+    }
+
     #[test]
     fn test_sniff_delimiter() {
         let mut app = AppBuilder::new("tests/data/small.bsv")

src/ui.rs

@@ -419,9 +419,9 @@ impl<'a> CsvTable<'a> {
             }
             remaining_width = remaining_width.saturating_sub(hlen);
         }
-        state.set_num_cols_rendered(num_cols_rendered);
+        state.num_cols_rendered = max(state.num_cols_rendered, num_cols_rendered);
         state.set_more_cols_to_show(has_more_cols_to_show);
-        state.col_ending_pos_x = col_ending_pos_x;
+        state.col_ending_pos_x = max(state.col_ending_pos_x, col_ending_pos_x);
         row_height
     }
 
@@ -674,6 +674,8 @@ impl<'a> CsvTable<'a> {
             state.enable_line_wrap,
             state.is_word_wrap,
         );
+        state.num_cols_rendered = 0;
+        state.col_ending_pos_x = 0;
         // state.debug = format!("get_row_heights elapsed: {:?}", _tic.elapsed());
         // state.debug = format!("row_heights: {:?}, area_height: {:?}", row_heights, area.height);
         ViewLayout {
@@ -1099,10 +1101,6 @@ impl CsvTableState {
         self.more_cols_to_show
     }
 
-    fn set_num_cols_rendered(&mut self, n: u64) {
-        self.num_cols_rendered = n;
-    }
-
     pub fn set_total_line_number(&mut self, n: usize, is_approx: bool) {
         self.total_line_number = Some((n, is_approx));
     }

tests/data/bad_73.csv

@@ -0,0 +1,14 @@
+COL1, COL2
+c1
+c2, v2
+c2, 4,
+c3
+c4
+c5
+c7
+c9
+c10
+c11
+c12
+c13
+c14,2