Fix unclickable URLs with scrolled viewport

Since scrolling the terminal moves around the underlying data structure
of the terminal, the URL selection would search for the URL at the
position where the click would have been without any scrolling.

By adding the viewport offset to the click position, the URL clicking
now searches at the correct location.

This fixes https://github.com/jwilm/alacritty/issues/2076.

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - 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
+- URLs not opening while terminal is scrolled
 
 ## Version 0.2.7
 

src/grid/mod.rs

@@ -465,6 +465,11 @@ impl<T> Grid<T> {
     pub fn contains(&self, point: &Point) -> bool {
         self.lines > point.line && self.cols > point.col
     }
+
+    #[inline]
+    pub fn display_offset(&self) -> usize {
+        self.display_offset
+    }
 }
 
 impl<'a, T> Iterator for GridIterator<'a, T> {

src/term/mod.rs

@@ -97,10 +97,11 @@ impl Search for Term {
     }
 
     fn url_search(&self, mut point: Point<usize>) -> Option<String> {
+        // Switch first line from top to bottom
         point.line = self.grid.num_lines().0 - point.line - 1;
 
-        // Limit the starting point to the last line in the history
-        point.line = min(point.line, self.grid.len() - 1);
+        // Remove viewport scroll offset
+        point.line += self.grid.display_offset();
 
         // Create forwards and backwards iterators
         let iterf = self.grid.iter_from(point);