Fix performance issues with text reflow

Fixes #2567.
Fixes #2414.

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - GUI programs launched by Alacritty starting in the background on X11
 - Text Cursor position when scrolling
+- Performance issues while resizing Alacritty
 
 ## 0.3.3
 

Cargo.lock

@@ -64,8 +64,8 @@ dependencies = [
  "notify 4.0.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_yaml 0.8.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "signal-hook 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -465,7 +465,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -508,8 +508,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -586,7 +586,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -614,7 +614,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -674,7 +674,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1248,7 +1248,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1786,17 +1786,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.92"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.92"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1806,7 +1806,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1816,7 +1816,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)",
  "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1971,7 +1971,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.15.36"
+version = "0.15.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1986,7 +1986,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2671,8 +2671,8 @@ dependencies = [
 "checksum security-framework-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9636f8989cbf61385ae4824b98c1aaa54c994d7d8b41f11c601ed799f0549a56"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
-"checksum serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)" = "32746bf0f26eab52f06af0d0aa1984f641341d06d8d673c693871da2d188c9be"
+"checksum serde 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)" = "960e29cf7004b3b6e65fc5002981400eb3ccc017a08a2406940823e58e7179a9"
-"checksum serde_derive 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)" = "46a3223d0c9ba936b61c0d2e3e559e3217dbfb8d65d06d26e8b3c25de38bae3e"
+"checksum serde_derive 1.0.93 (registry+https://github.com/rust-lang/crates.io-index)" = "c4cce6663696bd38272e90bf34a0267e1226156c33f52d3f3915a2dd5d802085"
 "checksum serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)" = "5a23aa71d4a4d43fdbfaac00eff68ba8a06a51759a89ac3304323e800c4dd40d"
 "checksum serde_yaml 0.8.9 (registry+https://github.com/rust-lang/crates.io-index)" = "38b08a9a90e5260fe01c6480ec7c811606df6d3a660415808c3c3fa8ed95b582"
 "checksum servo-fontconfig 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a088f8d775a5c5314aae09bd77340bc9c67d72b9a45258be34c83548b4814cd9"
@@ -2692,7 +2692,7 @@ dependencies = [
 "checksum static_assertions 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b4f8de36da215253eb5f24020bfaa0646613b48bf7ebe36cdfa37c3b3b33b241"
 "checksum stb_truetype 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "69b7df505db8e81d54ff8be4693421e5b543e08214bd8d99eb761fcb4d5668ba"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
-"checksum syn 0.15.36 (registry+https://github.com/rust-lang/crates.io-index)" = "8b4f551a91e2e3848aeef8751d0d4eec9489b6474c720fd4c55958d8d31a430c"
+"checksum syn 0.15.37 (registry+https://github.com/rust-lang/crates.io-index)" = "e11410033fd5cf69a1cf2084604e011190c56f11e08ffc53df880f5f65f1c6e4"
 "checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
 "checksum tempfile 3.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7dc4738f2e68ed2855de5ac9cdbe05c9216773ecde4739b2f095002ab03a13ef"
 "checksum termcolor 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "96d6098003bde162e4277c70665bd87c326f5a0c3f3fbfb285787fa482d54e6e"

alacritty_terminal/src/grid/mod.rs

@@ -189,6 +189,7 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
 
     pub fn resize(
         &mut self,
+        reflow: bool,
         lines: index::Line,
         cols: index::Column,
         cursor_pos: &mut Point,
@@ -206,8 +207,8 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
         }
 
         match self.cols.cmp(&cols) {
-            Ordering::Less => self.grow_cols(cols, cursor_pos, template),
+            Ordering::Less => self.grow_cols(reflow, cols, cursor_pos, template),
-            Ordering::Greater => self.shrink_cols(cols, template),
+            Ordering::Greater => self.shrink_cols(reflow, cols, template),
             Ordering::Equal => (),
         }
     }
@@ -252,93 +253,107 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
         self.display_offset = self.display_offset.saturating_sub(*lines_added);
     }
 
-    fn grow_cols(&mut self, cols: index::Column, cursor_pos: &mut Point, template: &T) {
+    fn grow_cols(
-        // Truncate all buffered lines
+        &mut self,
-        self.raw.grow_hidden(cols, template);
+        reflow: bool,
+        cols: index::Column,
+        cursor_pos: &mut Point,
+        template: &T,
+    ) {
+        let mut new_empty_lines = 0;
+        let mut new_raw: Vec<Row<T>> = Vec::with_capacity(self.raw.len());
+        for (i, mut row) in self.raw.drain().enumerate().rev() {
+            if let Some(last_row) = new_raw.last_mut() {
+                // Grow the current line if there's wrapped content available
+                if reflow
+                    && last_row.len() < cols.0
+                    && last_row.last().map(GridCell::is_wrap) == Some(true)
+                {
+                    // Remove wrap flag before appending additional cells
+                    if let Some(cell) = last_row.last_mut() {
+                        cell.set_wrap(false);
+                    }
 
-        let max_lines = self.lines.0 + self.max_scroll_limit;
+                    // Append as many cells from the next line as possible
+                    let len = min(row.len(), cols.0 - last_row.len());
+                    let mut cells = row.front_split_off(len);
+                    last_row.append(&mut cells);
 
-        // Iterate backwards with indices for mutation during iteration
+                    if row.is_empty() {
-        let mut i = self.raw.len();
+                        let raw_len = i + 1 + new_raw.len();;
-        while i > 0 {
+                        if raw_len < self.lines.0 || self.scroll_limit == 0 {
-            i -= 1;
+                            // Add new line and move lines up if we can't pull from history
+                            cursor_pos.line = Line(cursor_pos.line.saturating_sub(1));
+                            new_empty_lines += 1;
+                        } else {
+                            // Make sure viewport doesn't move if line is outside of the visible
+                            // area
+                            if i < self.display_offset {
+                                self.display_offset = self.display_offset.saturating_sub(1);
+                            }
 
-            // Grow the current line if there's wrapped content available
+                            // Remove one line from scrollback, since we just moved it to the
-            while i >= 1
+                            // viewport
-                && self.raw[i].len() < cols.0
+                            self.scroll_limit = self.scroll_limit.saturating_sub(1);
-                && self.raw[i].last().map(GridCell::is_wrap) == Some(true)
+                            self.display_offset = min(self.display_offset, self.scroll_limit);
-            {
-                // Remove wrap flag before appending additional cells
-                if let Some(cell) = self.raw[i].last_mut() {
-                    cell.set_wrap(false);
-                }
-
-                // Append as many cells from the next line as possible
-                let len = min(self.raw[i - 1].len(), cols.0 - self.raw[i].len());
-                let mut cells = self.raw[i - 1].front_split_off(len);
-                self.raw[i].append(&mut cells);
-
-                if self.raw[i - 1].is_empty() {
-                    // Remove following line if all cells have been drained
-                    self.raw.remove(i - 1);
-
-                    if self.raw.len() < self.lines.0 || self.scroll_limit == 0 {
-                        // Add new line and move lines up if we can't pull from history
-                        self.raw.insert(0, Row::new(cols, template), max_lines);
-                        cursor_pos.line = Line(cursor_pos.line.saturating_sub(1));
-                    } else {
-                        // Make sure viewport doesn't move if line is outside of the visible area
-                        if i < self.display_offset {
-                            self.display_offset = self.display_offset.saturating_sub(1);
                         }
 
-                        // Remove one line from scrollback, since we just moved it to the viewport
+                        // Don't push line into the new buffer
-                        self.scroll_limit = self.scroll_limit.saturating_sub(1);
+                        continue;
-                        self.display_offset = min(self.display_offset, self.scroll_limit);
+                    } else if let Some(cell) = last_row.last_mut() {
-                        i -= 1;
+                        // Set wrap flag if next line still has cells
+                        cell.set_wrap(true);
                     }
-                } else if let Some(cell) = self.raw[i].last_mut() {
-                    // Set wrap flag if next line still has cells
-                    cell.set_wrap(true);
                 }
             }
 
-            // Fill remaining cells
+            new_raw.push(row);
-            if self.raw[i].len() < cols.0 {
-                self.raw[i].grow(cols, template);
-            }
         }
 
+        // Add padding lines
+        new_raw.append(&mut vec![Row::new(cols, template); new_empty_lines]);
+
+        // Fill remaining cells and reverse iterator
+        let mut reversed = Vec::with_capacity(new_raw.len());
+        for mut row in new_raw.drain(..).rev() {
+            if row.len() < cols.0 {
+                row.grow(cols, template);
+            }
+            reversed.push(row);
+        }
+
+        self.raw.replace_inner(reversed);
+
         self.cols = cols;
     }
 
-    fn shrink_cols(&mut self, cols: index::Column, template: &T) {
+    fn shrink_cols(&mut self, reflow: bool, cols: index::Column, template: &T) {
-        // Truncate all buffered lines
+        let mut new_raw = Vec::with_capacity(self.raw.len());
-        self.raw.shrink_hidden(cols);
+        let mut buffered = None;
+        for (i, mut row) in self.raw.drain().enumerate().rev() {
+            if let Some(buffered) = buffered.take() {
+                row.append_front(buffered);
+            }
 
-        let max_lines = self.lines.0 + self.max_scroll_limit;
+            let mut wrapped = row.shrink(cols);
+            new_raw.push(row);
 
-        // Iterate backwards with indices for mutation during iteration
+            while let (Some(mut wrapped_cells), true) = (wrapped.take(), reflow) {
-        let mut i = self.raw.len();
-        while i > 0 {
-            i -= 1;
-
-            if let Some(mut new_row) = self.raw[i].shrink(cols) {
                 // Set line as wrapped if cells got removed
-                if let Some(cell) = self.raw[i].last_mut() {
+                if let Some(cell) = new_raw.last_mut().and_then(|r| r.last_mut()) {
                     cell.set_wrap(true);
                 }
 
-                if Some(true) == new_row.last().map(|c| c.is_wrap() && i >= 1)
+                if Some(true) == wrapped_cells.last().map(|c| c.is_wrap() && i >= 1)
-                    && new_row.len() < cols.0
+                    && wrapped_cells.len() < cols.0
                 {
                     // Make sure previous wrap flag doesn't linger around
-                    if let Some(cell) = new_row.last_mut() {
+                    if let Some(cell) = wrapped_cells.last_mut() {
                         cell.set_wrap(false);
                     }
 
                     // Add removed cells to start of next row
-                    self.raw[i - 1].append_front(new_row);
+                    buffered = Some(wrapped_cells);
                 } else {
                     // Make sure viewport doesn't move if line is outside of the visible area
                     if i < self.display_offset {
@@ -346,24 +361,27 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
                     }
 
                     // Make sure new row is at least as long as new width
-                    let occ = new_row.len();
+                    let occ = wrapped_cells.len();
                     if occ < cols.0 {
-                        new_row.append(&mut vec![*template; cols.0 - occ]);
+                        wrapped_cells.append(&mut vec![*template; cols.0 - occ]);
                     }
-                    let row = Row::from_vec(new_row, occ);
+                    let mut row = Row::from_vec(wrapped_cells, occ);
+
+                    // Since inserted might exceed cols, we need to check it again
+                    wrapped = row.shrink(cols);
 
                     // Add new row with all removed cells
-                    self.raw.insert(i, row, max_lines);
+                    new_raw.push(row);
 
                     // Increase scrollback history
                     self.scroll_limit = min(self.scroll_limit + 1, self.max_scroll_limit);
-
-                    // Since inserted might exceed cols, we need to check the same line again
-                    i += 1;
                 }
             }
         }
 
+        let mut reversed: Vec<Row<T>> = new_raw.drain(..).rev().collect();
+        reversed.truncate(self.max_scroll_limit + self.lines.0);
+        self.raw.replace_inner(reversed);
         self.cols = cols;
     }
 

alacritty_terminal/src/grid/tests.rs

@@ -140,7 +140,7 @@ fn shrink_reflow() {
     grid[Line(0)][Column(3)] = cell('4');
     grid[Line(0)][Column(4)] = cell('5');
 
-    grid.resize(Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 3);
 
@@ -166,8 +166,8 @@ fn shrink_reflow_twice() {
     grid[Line(0)][Column(3)] = cell('4');
     grid[Line(0)][Column(4)] = cell('5');
 
-    grid.resize(Line(1), Column(4), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(1), Column(4), &mut Point::new(Line(0), Column(0)), &Cell::default());
-    grid.resize(Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 3);
 
@@ -193,7 +193,7 @@ fn shrink_reflow_empty_cell_inside_line() {
     grid[Line(0)][Column(3)] = cell('4');
     grid[Line(0)][Column(4)] = Cell::default();
 
-    grid.resize(Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 2);
 
@@ -205,7 +205,7 @@ fn shrink_reflow_empty_cell_inside_line() {
     assert_eq!(grid[0][Column(0)], cell('3'));
     assert_eq!(grid[0][Column(1)], cell('4'));
 
-    grid.resize(Line(1), Column(1), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(1), Column(1), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 4);
 
@@ -230,7 +230,7 @@ fn grow_reflow() {
     grid[Line(1)][Column(0)] = cell('3');
     grid[Line(1)][Column(1)] = Cell::default();
 
-    grid.resize(Line(2), Column(3), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(2), Column(3), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 2);
 
@@ -256,7 +256,7 @@ fn grow_reflow_multiline() {
     grid[Line(2)][Column(0)] = cell('5');
     grid[Line(2)][Column(1)] = cell('6');
 
-    grid.resize(Line(3), Column(6), &mut Point::new(Line(0), Column(0)), &Cell::default());
+    grid.resize(true, Line(3), Column(6), &mut Point::new(Line(0), Column(0)), &Cell::default());
 
     assert_eq!(grid.len(), 3);
 
@@ -279,6 +279,47 @@ fn grow_reflow_multiline() {
     }
 }
 
+#[test]
+fn grow_reflow_disabled() {
+    let mut grid = Grid::new(Line(2), Column(2), 0, cell('x'));
+    grid[Line(0)][Column(0)] = cell('1');
+    grid[Line(0)][Column(1)] = wrap_cell('2');
+    grid[Line(1)][Column(0)] = cell('3');
+    grid[Line(1)][Column(1)] = Cell::default();
+
+    grid.resize(false, Line(2), Column(3), &mut Point::new(Line(0), Column(0)), &Cell::default());
+
+    assert_eq!(grid.len(), 2);
+
+    assert_eq!(grid[1].len(), 3);
+    assert_eq!(grid[1][Column(0)], cell('1'));
+    assert_eq!(grid[1][Column(1)], wrap_cell('2'));
+    assert_eq!(grid[1][Column(2)], Cell::default());
+
+    assert_eq!(grid[0].len(), 3);
+    assert_eq!(grid[0][Column(0)], cell('3'));
+    assert_eq!(grid[0][Column(1)], Cell::default());
+    assert_eq!(grid[0][Column(2)], Cell::default());
+}
+
+#[test]
+fn shrink_reflow_disabled() {
+    let mut grid = Grid::new(Line(1), Column(5), 2, cell('x'));
+    grid[Line(0)][Column(0)] = cell('1');
+    grid[Line(0)][Column(1)] = cell('2');
+    grid[Line(0)][Column(2)] = cell('3');
+    grid[Line(0)][Column(3)] = cell('4');
+    grid[Line(0)][Column(4)] = cell('5');
+
+    grid.resize(false, Line(1), Column(2), &mut Point::new(Line(0), Column(0)), &Cell::default());
+
+    assert_eq!(grid.len(), 1);
+
+    assert_eq!(grid[0].len(), 2);
+    assert_eq!(grid[0][Column(0)], cell('1'));
+    assert_eq!(grid[0][Column(1)], cell('2'));
+}
+
 fn cell(c: char) -> Cell {
     let mut cell = Cell::default();
     cell.c = c;

alacritty_terminal/src/term/mod.rs

@@ -1228,13 +1228,11 @@ impl Term {
         debug!("New num_cols is {} and num_lines is {}", num_cols, num_lines);
 
         // Resize grids to new size
-        let alt_cursor_point = if self.mode.contains(TermMode::ALT_SCREEN) {
+        let is_alt = self.mode.contains(TermMode::ALT_SCREEN);
-            &mut self.cursor_save.point
+        let alt_cursor_point =
-        } else {
+            if is_alt { &mut self.cursor_save.point } else { &mut self.cursor_save_alt.point };
-            &mut self.cursor_save_alt.point
+        self.grid.resize(!is_alt, num_lines, num_cols, &mut self.cursor.point, &Cell::default());
-        };
+        self.alt_grid.resize(is_alt, num_lines, num_cols, alt_cursor_point, &Cell::default());
-        self.grid.resize(num_lines, num_cols, &mut self.cursor.point, &Cell::default());
-        self.alt_grid.resize(num_lines, num_cols, alt_cursor_point, &Cell::default());
 
         // Reset scrolling region to new size
         self.scroll_region = Line(0)..self.grid.num_lines();

copypasta/examples/primary_selection.rs

@@ -2,6 +2,7 @@ extern crate copypasta;
 
 #[cfg(target_os = "linux")]
 use copypasta::x11_clipboard::{Primary, X11ClipboardContext};
+#[cfg(target_os = "linux")]
 use copypasta::ClipboardProvider;
 
 #[cfg(target_os = "linux")]