From 6a0757ebf9535c45df121201e71656ed9fa39974 Mon Sep 17 00:00:00 2001
From: Antonio Scandurra <me@as-cii.com>
Date: Thu, 20 May 2021 12:52:58 +0200
Subject: [PATCH] Don't store rightmost row/char-column as a Point

---
 zed/src/editor/buffer/mod.rs           | 15 ++++++++++-----
 zed/src/editor/buffer/rope.rs          | 24 +++++++++++++++---------
 zed/src/editor/display_map/fold_map.rs |  5 +++--
 3 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/zed/src/editor/buffer/mod.rs b/zed/src/editor/buffer/mod.rs
index ab91ef83894a691c0ad4d588d0c42312d96204da..ddf40a983293df16dee765f718753cf73563ac0f 100644
--- a/zed/src/editor/buffer/mod.rs
+++ b/zed/src/editor/buffer/mod.rs
@@ -2525,7 +2525,8 @@ mod tests {
                     lines: Point::new(1, 0),
                     first_line_chars: 1,
                     last_line_chars: 0,
-                    rightmost_point: Point::new(0, 1),
+                    rightmost_row: 0,
+                    rightmost_row_chars: 1,
                 }
             );
             assert_eq!(
@@ -2535,7 +2536,8 @@ mod tests {
                     lines: Point::new(3, 0),
                     first_line_chars: 1,
                     last_line_chars: 0,
-                    rightmost_point: Point::new(2, 4),
+                    rightmost_row: 2,
+                    rightmost_row_chars: 4,
                 }
             );
             assert_eq!(
@@ -2545,7 +2547,8 @@ mod tests {
                     lines: Point::new(4, 1),
                     first_line_chars: 2,
                     last_line_chars: 1,
-                    rightmost_point: Point::new(3, 6),
+                    rightmost_row: 3,
+                    rightmost_row_chars: 6,
                 }
             );
             assert_eq!(
@@ -2555,7 +2558,8 @@ mod tests {
                     lines: Point::new(4, 3),
                     first_line_chars: 2,
                     last_line_chars: 3,
-                    rightmost_point: Point::new(3, 6),
+                    rightmost_row: 3,
+                    rightmost_row_chars: 6,
                 }
             );
             assert_eq!(
@@ -2565,7 +2569,8 @@ mod tests {
                     lines: Point::new(2, 3),
                     first_line_chars: 4,
                     last_line_chars: 3,
-                    rightmost_point: Point::new(1, 6),
+                    rightmost_row: 1,
+                    rightmost_row_chars: 6,
                 }
             );
             buffer
diff --git a/zed/src/editor/buffer/rope.rs b/zed/src/editor/buffer/rope.rs
index d03afaf2a72fe57838a26a038eb1b1cf3da8870a..83c5ee4d5dec7707393f41d572562384529d160d 100644
--- a/zed/src/editor/buffer/rope.rs
+++ b/zed/src/editor/buffer/rope.rs
@@ -392,7 +392,8 @@ pub struct TextSummary {
     pub lines: Point,
     pub first_line_chars: u32,
     pub last_line_chars: u32,
-    pub rightmost_point: Point,
+    pub rightmost_row: u32,
+    pub rightmost_row_chars: u32,
 }
 
 impl<'a> From<&'a str> for TextSummary {
@@ -400,7 +401,8 @@ impl<'a> From<&'a str> for TextSummary {
         let mut lines = Point::new(0, 0);
         let mut first_line_chars = 0;
         let mut last_line_chars = 0;
-        let mut rightmost_point = Point::new(0, 0);
+        let mut rightmost_row = 0;
+        let mut rightmost_row_chars = 0;
         for c in text.chars() {
             if c == '\n' {
                 lines.row += 1;
@@ -415,8 +417,9 @@ impl<'a> From<&'a str> for TextSummary {
                 first_line_chars = last_line_chars;
             }
 
-            if last_line_chars > rightmost_point.column {
-                rightmost_point = Point::new(lines.row, last_line_chars);
+            if last_line_chars > rightmost_row_chars {
+                rightmost_row = lines.row;
+                rightmost_row_chars = last_line_chars;
             }
         }
 
@@ -425,7 +428,8 @@ impl<'a> From<&'a str> for TextSummary {
             lines,
             first_line_chars,
             last_line_chars,
-            rightmost_point,
+            rightmost_row,
+            rightmost_row_chars,
         }
     }
 }
@@ -441,11 +445,13 @@ impl sum_tree::Summary for TextSummary {
 impl<'a> std::ops::AddAssign<&'a Self> for TextSummary {
     fn add_assign(&mut self, other: &'a Self) {
         let joined_chars = self.last_line_chars + other.first_line_chars;
-        if joined_chars > self.rightmost_point.column {
-            self.rightmost_point = Point::new(self.lines.row, joined_chars);
+        if joined_chars > self.rightmost_row_chars {
+            self.rightmost_row = self.lines.row;
+            self.rightmost_row_chars = joined_chars;
         }
-        if other.rightmost_point.column > self.rightmost_point.column {
-            self.rightmost_point = self.lines + other.rightmost_point;
+        if other.rightmost_row_chars > self.rightmost_row_chars {
+            self.rightmost_row = self.lines.row + other.rightmost_row;
+            self.rightmost_row_chars = other.rightmost_row_chars;
         }
 
         if self.lines.row == 0 {
diff --git a/zed/src/editor/display_map/fold_map.rs b/zed/src/editor/display_map/fold_map.rs
index 121909cba71cebeb47aa5cf022bed30434434fd8..5494d61c9a51fd064c2374f80916fec005b6e1ea 100644
--- a/zed/src/editor/display_map/fold_map.rs
+++ b/zed/src/editor/display_map/fold_map.rs
@@ -68,7 +68,7 @@ impl FoldMap {
     }
 
     pub fn rightmost_row(&self, ctx: &AppContext) -> u32 {
-        self.sync(ctx).summary().display.rightmost_point.row
+        self.sync(ctx).summary().display.rightmost_row
     }
 
     pub fn folds_in_range<'a, T>(
@@ -340,7 +340,8 @@ impl FoldMap {
                                     lines,
                                     first_line_chars: chars,
                                     last_line_chars: chars,
-                                    rightmost_point: Point::new(0, chars),
+                                    rightmost_row: 0,
+                                    rightmost_row_chars: chars,
                                 },
                                 buffer: buffer.text_summary_for_range(fold.start..fold.end),
                             },