Scale IME position by hidpi_factor

Since the IME was positioned using physical coordinates,
the location would be incorrect with monitors using a DPR
other than 1.0.

This has been resolved by converting the physical position
to a logical position using the methods built into winit.

Fixes #2056.

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Remove error message when reloading an empty config
 - Allow disabling URL launching by setting the value of `mouse.url.launcher` to `None`
 - Corrected the `window.decorations` config documentation for macOS
+- Fix IME position on HiDPI displays
 
 ## Version 0.2.7
 

src/display.rs

@@ -18,7 +18,7 @@ use std::sync::mpsc;
 use std::f64;
 
 use parking_lot::MutexGuard;
-use glutin::dpi::{LogicalPosition, PhysicalSize};
+use glutin::dpi::{PhysicalPosition, PhysicalSize};
 
 use crate::cli;
 use crate::config::Config;
@@ -488,15 +488,19 @@ impl Display {
 
     /// Adjust the IME editor position according to the new location of the cursor
     pub fn update_ime_position(&mut self, terminal: &Term) {
-        use crate::index::{Column, Line, Point};
-        use crate::term::SizeInfo;
-        let Point{line: Line(row), col: Column(col)} = terminal.cursor().point;
-        let SizeInfo{cell_width: cw,
-                    cell_height: ch,
-                    padding_x: px,
-                    padding_y: py, ..} = *terminal.size_info();
-        let nspot_y = (py + (row + 1) as f32 * ch) as i32;
-        let nspot_x = (px + col as f32 * cw) as i32;
-        self.window().set_ime_spot(LogicalPosition::from((nspot_x, nspot_y)));
+        let point = terminal.cursor().point;
+        let SizeInfo {
+            cell_width: cw,
+            cell_height: ch,
+            padding_x: px,
+            padding_y: py,
+            ..
+        } = *terminal.size_info();
+
+        let dpr = self.window().hidpi_factor();
+        let nspot_x = f64::from(px + point.col.0 as f32 * cw);
+        let nspot_y = f64::from(py + (point.line.0 + 1) as f32 * ch);
+
+        self.window().set_ime_spot(PhysicalPosition::from((nspot_x, nspot_y)).to_logical(dpr));
     }
 }