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Fix selections not being modified quite correctly with text edits.

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This commit is contained in:
Nathan Vegdahl 2021-07-21 09:23:01 -07:00
parent 198fe40951
commit bc85c85501
1 changed files with 15 additions and 2 deletions
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17
helix-core/src/selection.rs
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@ -109,8 +109,21 @@ impl Range {
/// Map a range through a set of changes. Returns a new range representing the same position
/// after the changes are applied.
pub fn map(self, changes: &ChangeSet) -> Self {
let anchor = changes.map_pos(self.anchor, Assoc::After);
let head = changes.map_pos(self.head, Assoc::After);
use std::cmp::Ordering;
let (anchor, head) = match self.anchor.cmp(&self.head) {
Ordering::Equal => (
changes.map_pos(self.anchor, Assoc::After),
changes.map_pos(self.head, Assoc::After),
),
Ordering::Less => (
changes.map_pos(self.anchor, Assoc::After),
changes.map_pos(self.head, Assoc::Before),
),
Ordering::Greater => (
changes.map_pos(self.anchor, Assoc::Before),
changes.map_pos(self.head, Assoc::After),
),
};
// We want to return a new `Range` with `horiz == None` every time,
// even if the anchor and head haven't changed, because we don't