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editor: Fix multicursor indent edge case where few lines would indent incorrectly (#30461)

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This should have been part of [editor: Fix inconsistent relative indent
when using tab with multi
cursors](https://github.com/zed-industries/zed/pull/29519)

Before / After:


https://github.com/user-attachments/assets/b7ab0eef-2764-44dc-b51f-b96dccd5ecb3

Release Notes:

- N/A

---------

Co-authored-by: Ben Kunkle <ben.kunkle@gmail.com>
This commit is contained in:
Smit Barmase 2025-05-10 06:13:15 -07:00 • committed by GitHub
parent 471e02d48f
commit 172a475515
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GPG key ID: B5690EEEBB952194
2 changed files with 123 additions and 10 deletions
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117
crates/editor/src/editor_tests.rs
View file

@ -2871,7 +2871,8 @@ async fn test_tab_in_leading_whitespace_auto_indents_lines(cx: &mut TestAppConte
);
cx.update_buffer(|buffer, cx| buffer.set_language(Some(language), cx));
// when all cursors are to the left of the suggested indent, then auto-indent all.
// test when all cursors are not at suggested indent
// then simply move to their suggested indent location
cx.set_state(indoc! {"
const a: B = (
c(
@ -2888,9 +2889,8 @@ async fn test_tab_in_leading_whitespace_auto_indents_lines(cx: &mut TestAppConte
);
"});
// cursors that are already at the suggested indent level do not move
// until other cursors that are to the left of the suggested indent
// auto-indent.
// test cursor already at suggested indent not moving when
// other cursors are yet to reach their suggested indents
cx.set_state(indoc! {"
ˇ
const a: B = (
@ -2914,8 +2914,7 @@ async fn test_tab_in_leading_whitespace_auto_indents_lines(cx: &mut TestAppConte
ˇ)
);
"});
// once all multi-cursors are at the suggested
// indent level, they all insert a soft tab together.
// test when all cursors are at suggested indent then tab is inserted
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
ˇ
@ -2929,6 +2928,112 @@ async fn test_tab_in_leading_whitespace_auto_indents_lines(cx: &mut TestAppConte
);
"});
// test when current indent is less than suggested indent,
// we adjust line to match suggested indent and move cursor to it
//
// when no other cursor is at word boundary, all of them should move
cx.set_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ )
ˇ )
);
"});
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ)
ˇ)
);
"});
// test when current indent is less than suggested indent,
// we adjust line to match suggested indent and move cursor to it
//
// when some other cursor is at word boundary, it should not move
cx.set_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ )
ˇ)
);
"});
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ)
ˇ)
);
"});
// test when current indent is more than suggested indent,
// we just move cursor to current indent instead of suggested indent
//
// when no other cursor is at word boundary, all of them should move
cx.set_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ )
ˇ )
);
"});
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ)
ˇ)
);
"});
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ)
ˇ)
);
"});
// test when current indent is more than suggested indent,
// we just move cursor to current indent instead of suggested indent
//
// when some other cursor is at word boundary, it doesn't move
cx.set_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ )
ˇ)
);
"});
cx.update_editor(|e, window, cx| e.tab(&Tab, window, cx));
cx.assert_editor_state(indoc! {"
const a: B = (
c(
d(
ˇ
ˇ)
ˇ)
);
"});
// handle auto-indent when there are multiple cursors on the same line
cx.set_state(indoc! {"
const a: B = (