fix zero width characters at the end of a row

3 files changed, 15 insertions, 1 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 610f008..a5c5329 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixed
+
+* Fix zero-width characters when the cursor is at the end of a row.
+
 ## [0.6.1] - 2019-11-13
 
 ### Added
diff --git a/src/screen.rs b/src/screen.rs
index c563f37..f28fb90 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -592,7 +592,6 @@ impl Screen {
         let attrs = self.attrs;
 
         self.grid_mut().col_wrap(width);
-        let cell = self.current_cell_mut();
 
         if width == 0 {
             if pos.col > 0 {
@@ -621,6 +620,7 @@ impl Screen {
                 }
             }
         } else {
+            let cell = self.current_cell_mut();
             cell.set(c, attrs);
             self.grid_mut().col_inc(1);
             if width > 1 {
diff --git a/tests/text.rs b/tests/text.rs
index e0b4cee..cf90b89 100644
--- a/tests/text.rs
+++ b/tests/text.rs
@@ -154,6 +154,14 @@ fn combining() {
     let screen = parser.screen().clone();
     parser.process(b"\x1bcabcdefg");
     assert_eq!(parser.screen().contents_diff(&screen), b"");
+
+    parser.process(b"\x1bcaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
+    assert_eq!(parser.screen().cursor_position(), (0, 80));
+    assert_eq!(parser.screen().contents(), "a".repeat(80));
+
+    parser.process("\u{0301}".as_bytes());
+    assert_eq!(parser.screen().cursor_position(), (0, 80));
+    assert_eq!(parser.screen().contents(), format!("{}á", "a".repeat(79)));
 }
 
 #[test]