Fixes the hang introduced in #44995 (which was reverted in #45011) and
re-enables the optimization.
## Background
PR #44995 introduced an optimization to skip rendering lines that are
clipped by parent containers (e.g., when a large AutoHeight editor is
inside a scrollable List). This significantly improved performance for
large diffs in the Agent Panel.
However, #45011 reverted this change because it caused the main thread
to hang for 100+ seconds in certain scenarios, requiring a force quit to
recover.
## Root Cause
The original analysis in #45011 suggested that visible_bounds wasn’t
being intersected properly, but that was incorrect—the intersection via
with_content_mask works correctly. The actual bug: when an editor is
positioned above the visible viewport (e.g., scrolled past in a List),
the clipping calculation produces a start_row that exceeds max_row:
1. Editor’s bounds.origin.y becomes very negative (e.g., -10000px)
2. After intersection, visible_bounds.origin.y is at the viewport top
(e.g., 0)
3. clipped_top_in_lines = (0 - (-10000)) / line_height = huge number
4. start_row = huge number, but end_row is clamped to max_row
5. This creates an invalid range where start_row > end_row
This caused two different failures depending on build mode:
- Debug mode: Panic from subtraction overflow in
Range<DisplayRow>::len()
- Release mode: Integer wraparound causing blocks_in_range to enter an
infinite loop (the 100+ second hang)
## Fix
Simply clamp start_row to max_row, ensuring the row range is always
valid:
```rs
let start_row = cmp::min(
DisplayRow((scroll_position.y + clipped_top_in_lines).floor() as u32),
max_row,
);
```
## Testing
Added a regression test that draws an editor at y=-10000 to simulate an
editor that’s been scrolled past in a List. This would panic in debug
mode (and hang in release mode) before the fix.
Release Notes:
- Improved agent panel performance when rendering large diffs.
This reverts commit f576ec7a15 (#44995).
The optimization introduced a regression that causes the main thread to
hang for **100+ seconds** in certain scenarios, requiring a force quit
to recover.
## Analysis from spindump
When a large `AutoHeight` editor is displayed inside a `List` (e.g.,
Agent Panel thread view), the clipping calculation can produce invalid
row ranges:
1. `visible_bounds` from `window.content_mask().bounds` represents the
window's content mask, not the intersection with the editor
2. When the editor is partially scrolled out of view,
`clipped_top_in_lines` becomes extremely large
3. This causes `start_row` to be computed as an astronomically high
value
4. `blocks_in_range(start_row..end_row)` then spends excessive time in
`Cursor::search_forward` iterating through the block tree
The spindump showed **~46% of samples** (459/1001 over 10+ seconds)
stuck in `BlockSnapshot::blocks_in_range()`, specifically in cursor
iteration.
### Heaviest stack trace
```
EditorElement::prepaint
└─ blocks_in_range + 236
└─ Cursor::search_forward (459 samples)
```
## Symptoms
- Main thread unresponsive for 33-113 seconds before sampling even began
- UI completely frozen
- High CPU usage on main thread (10+ seconds of CPU time in the sample)
- Force quit required to recover
## Path forward
The original optimization goal (reducing line layout work for clipped
editors) is valid, but the implementation needs to:
1. Correctly calculate the **intersection** of editor bounds with the
visible viewport
2. Ensure row calculations stay within valid ranges (clamped to
`max_row`)
3. Handle edge cases where the editor is completely outside the visible
bounds
Release Notes:
- Fixed a hang that could occur when viewing large diffs in the Agent
Panel
Fixes#44997
## Summary
Optimizes editor rendering when an editor is partially clipped by a
parent container (e.g., a `List`). The editor now only lays out and
renders lines that are actually visible within the viewport, rather than
all lines in the document.
## Problem
When an `AutoHeight` editor with thousands of lines is placed inside a
scrollable `List` (such as in the Agent Panel thread view), the editor
would lay out **all** lines during prepaint, even though only a small
portion was visible. Profiling showed that ~50% of frame time was spent
in `EditorElement::prepaint` → `LineWithInvisibles::from_chunks`,
processing thousands of invisible lines.
## Solution
Calculate the intersection of the editor's bounds with the current
content mask (which represents the visible viewport after all parent
clipping). Use this to determine:
1. `clipped_top_in_lines` - how many lines are clipped above the
viewport
2. `visible_height_in_lines` - how many lines are actually visible
Then adjust `start_row` and `end_row` to only include visible lines. The
parent container handles positioning, so `scroll_position` remains
unchanged for paint calculations.
## Example
For a 3000-line editor where only 50 lines are visible:
- **Before**: Lay out and render 3000 lines
- **After**: Lay out and render ~50 lines
## Testing
Verified the following scenarios work correctly:
- Editor fully visible (no clipping)
- Editor clipped from top
- Editor clipped from bottom
- Editor completely outside viewport (renders nothing)
- Fractional line clipping at boundaries
- Scrollable editors with internal scroll state inside a clipped
container
Release Notes:
- Improved agent panel performance when rendering large diffs.
This PR introduces a new `MultiBufferOffset` new type wrapping size. The
goal of this is to make it clear at the type level when we are
interacting with offsets of a multi buffer versus offsets of a language
/ text buffer. This improves readability of things quite a bit by making
it clear what kind of offsets one is working with while also reducing
accidental bugs by using the wrong kin of offset for the wrong API.
This PR also uncovered two minor bugs due to that.
Does not yet introduce the MultiBufferPoint equivalent, that is for a
follow up PR.
Release Notes:
- N/A *or* Added/Fixed/Improved ...
Re-applies https://github.com/zed-industries/zed/pull/30840
This PR re-applies the initial
[PR](https://github.com/zed-industries/zed/pull/30840). As it was closed
because it was hard to land, because of the many conflicts. This PR
re-applies the changes for it.
In several cases we were creating multiple display_map
snapshots within the same root-level function call.
Creating a display_map snapshot is quite slow, and in some
cases we were creating the snapshot multiple times.
Release Notes:
- N/A
We have unnecessary clones for the fields here as most of the snapshots
contain the others hierarchically.
Release Notes:
- N/A *or* Added/Fixed/Improved ...
Closes https://github.com/zed-industries/zed/issues/38690Closes#37353
### Background
On Windows, paths are normally separated by `\`, unlike mac and linux
where they are separated by `/`. When editing code in a project that
uses a different path style than your local system (e.g. remoting from
Windows to Linux, using WSL, and collaboration between windows and unix
users), the correct separator for a path may differ from the "native"
separator.
Previously, to work around this, Zed converted paths' separators in
numerous places. This was applied to both absolute and relative paths,
leading to incorrect conversions in some cases.
### Solution
Many code paths in Zed use paths that are *relative* to either a
worktree root or a git repository. This PR introduces a dedicated type
for these paths called `RelPath`, which stores the path in the same way
regardless of host platform, and offers `Path`-like manipulation APIs.
RelPath supports *displaying* the path using either separator, so that
we can display paths in a style that is determined at runtime based on
the current project.
The representation of absolute paths is left untouched, for now.
Absolute paths are different from relative paths because (except in
contexts where we know that the path refers to the local filesystem)
they should generally be treated as opaque strings. Currently we use a
mix of types for these paths (std::path::Path, String, SanitizedPath).
Release Notes:
- N/A
---------
Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Peter Tripp <petertripp@gmail.com>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
Co-authored-by: Lukas Wirth <me@lukaswirth.dev>
When the cursor was sitting on a syntactically insignificant character,
like a `{` or `,`, this function was selecting only that character, when
what the user likely wanted was to select the next larger syntax node.
Those punctuation characters all seemed to be not "named", in
tree-sitter terminology, so I updated the function to walk up the node
tree until it found a node where `is_named()` is true.
Closes#4555
Also, while writing the tests, the output of a failing test with the
wrong thing selected was harder to read than it needed to be.
It used to output a diff of ranges, like this:
<img width="217" height="111" alt="image"
src="https://github.com/user-attachments/assets/00de53a8-8776-47aa-8101-5a5b5bc3fa5e"
/>
I leveraged the existing `generate_marked_text` helper function and
updated the assertion to output a diff of the text with the selection
markers:
<img width="211" height="116" alt="image"
src="https://github.com/user-attachments/assets/53b2b882-2676-4c70-8718-e2e2ba6f254e"
/>
Happy to make that a separate PR, if needed.
Release Notes:
- Fixed Editor select_larger_syntax_node to be smart about punctuation.
The Zed Plex fonts were found to violate the OFL by using the word Plex
in the name.
Lilex has better ligatures and box-drawing characters than Zed Plex
Mono, but Zed Plex Sans should be identical
to IBM Plex Sans.
Closes#15542Closeszed-industries/zed-fonts#31
Release Notes:
- The "Zed Plex Sans" and "Zed Plex Mono" fonts have been replaced with
"IBM Plex Sans" and "Lilex". The old names still work for backward
compatibility. Other than fixing line-drawing characters, and improving
the ligatures, there should be little visual change as the fonts are all
of the same family.
- Introduced ".ZedSans" and ".ZedMono" as aliases to allow us to easily
change the default fonts in the future. These currently default to "IBM
Plex Sans" and "Lilex" respectively.
In #32656 I generalized the argument to change selections to allow
controling both the scroll and the nav history (and the completion
trigger).
To avoid conflicting with ongoing debugger cherry-picks I left the
argument as an `impl Into<>`, but I think it's clearer to make callers
specify what they want here.
I converted a lot of `None` arguments to `SelectionEffects::no_scroll()`
to be exactly compatible; but I think many people used none as an "i
don't care" value in which case Default::default() might be more
appropraite
Closes #ISSUE
Release Notes:
- N/A
In #32656 I generalized the argument to change selections to allow
controling both the scroll and the nav history (and the completion
trigger).
To avoid conflicting with ongoing debugger cherry-picks I left the
argument as an `impl Into<>`, but I think it's clearer to make callers
specify what they want here.
I converted a lot of `None` arguments to `SelectionEffects::no_scroll()`
to be exactly compatible; but I think many people used none as an "i
don't care" value in which case Default::default() might be more
appropraite
* Adds a `diagnostics_max_severity: null` editor settings that has
previous hardcoded default, `warning`
* Make inline diagnostics to inherit this setting by default (can be
overridden with its own max_severity setting)
* Allows to toggle diagnostics in the editor menu and via new action,
`editor::ToggleDiagnostics`
Closes https://github.com/zed-industries/zed/issues/4686
Release Notes:
- N/A *or* Added/Fixed/Improved ...
Release Notes:
- Fixed completions with multiple cursors leaving duplicated prefixes.
- Fixed crash when accepting a completion in a multibuffer with multiple
cursors.
- Vim: improved `single-repeat` after accepting a completion, now
pressing `.` to replay the completion will re-insert the completion text
at the cursor position.
This PR lightly refactors the `EditorMode::Full` exposing two new
methods: `is_full` and `set_mode`.
Motivation is to expose fields that modify the behavior when the editor
is in `Full` mode. By using is `mode.is_full()` instead of
`EditorMode::Full` we can introduce new fields without breaking other
places in the code.
Release Notes:
- N/A
Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Release Notes:
- Multibuffers now use less vertical space for excerpt boundaries.
Additionally the expand up/down arrows are hidden at the start and end
of the buffers
---------
Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Zed AI <claude-3.5-sonnet@zed.dev>
There's still a bit more work to do on this, but this PR is compiling
(with warnings) after eliminating the key types. When the tasks below
are complete, this will be the new narrative for GPUI:
- `Entity<T>` - This replaces `View<T>`/`Model<T>`. It represents a unit
of state, and if `T` implements `Render`, then `Entity<T>` implements
`Element`.
- `&mut App` This replaces `AppContext` and represents the app.
- `&mut Context<T>` This replaces `ModelContext` and derefs to `App`. It
is provided by the framework when updating an entity.
- `&mut Window` Broken out of `&mut WindowContext` which no longer
exists. Every method that once took `&mut WindowContext` now takes `&mut
Window, &mut App` and every method that took `&mut ViewContext<T>` now
takes `&mut Window, &mut Context<T>`
Not pictured here are the two other failed attempts. It's been quite a
month!
Tasks:
- [x] Remove `View`, `ViewContext`, `WindowContext` and thread through
`Window`
- [x] [@cole-miller @mikayla-maki] Redraw window when entities change
- [x] [@cole-miller @mikayla-maki] Get examples and Zed running
- [x] [@cole-miller @mikayla-maki] Fix Zed rendering
- [x] [@mikayla-maki] Fix todo! macros and comments
- [x] Fix a bug where the editor would not be redrawn because of view
caching
- [x] remove publicness window.notify() and replace with
`AppContext::notify`
- [x] remove `observe_new_window_models`, replace with
`observe_new_models` with an optional window
- [x] Fix a bug where the project panel would not be redrawn because of
the wrong refresh() call being used
- [x] Fix the tests
- [x] Fix warnings by eliminating `Window` params or using `_`
- [x] Fix conflicts
- [x] Simplify generic code where possible
- [x] Rename types
- [ ] Update docs
### issues post merge
- [x] Issues switching between normal and insert mode
- [x] Assistant re-rendering failure
- [x] Vim test failures
- [x] Mac build issue
Release Notes:
- N/A
---------
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Joseph <joseph@zed.dev>
Co-authored-by: max <max@zed.dev>
Co-authored-by: Michael Sloan <michael@zed.dev>
Co-authored-by: Mikayla Maki <mikaylamaki@Mikaylas-MacBook-Pro.local>
Co-authored-by: Mikayla <mikayla.c.maki@gmail.com>
Co-authored-by: joão <joao@zed.dev>
Fixes https://github.com/zed-industries/zed/issues/18405
In https://github.com/zed-industries/zed/pull/18313, we introduced a
problem where git addition highlights might spuriously return when
undoing certain changes. It turned out, there were already some cases
where git hunk highlighting was incorrect when editing at the boundaries
of expanded diff hunks.
In this PR, I've introduced a test helper method for more rigorously
(and readably) testing the editor's git state. You can assert about the
entire state of an editor's diff decorations using a formatted diff:
```rust
cx.assert_diff_hunks(
r#"
- use some::mod1;
use some::mod2;
const A: u32 = 42;
- const B: u32 = 42;
const C: u32 = 42;
fn main() {
- println!("hello");
+ //println!("hello");
println!("world");
+ //
+ //
}
fn another() {
println!("another");
+ println!("another");
}
- fn another2() {
println!("another2");
}
"#
.unindent(),
);
```
This will assert about the editor's actual row highlights, not just the
editor's internal hunk-tracking state.
I rewrote all of our editor diff tests to use these more high-level
assertions, and it caught the new bug, as well as some pre-existing bugs
in the highlighting of added content.
The problem was how we *remove* highlighted rows. Previously, it relied
on supplying exactly the same range as one that we had previously
highlighted. I've added a `remove_highlighted_rows(ranges)` APIs which
is much simpler - it clears out any row ranges that intersect the given
ranges (which is all that we need for the Git diff use case).
Release Notes:
- N/A
This PR introduces functionality for creating *branches* of buffers that
can be used to preview and edit change sets that haven't yet been
applied to the buffers themselves.
Release Notes:
- N/A
---------
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Marshall <marshall@zed.dev>
Supersedes https://github.com/zed-industries/zed/pull/12090fixes#5180fixes#5055
See original PR for an example of the feature at work.
This PR changes the settings interface to be backwards compatible, and
adds the `ui_font_fallbacks`, `buffer_font_fallbacks`, and
`terminal.font_fallbacks` settings.
Release Notes:
- Added support for font fallbacks via three new settings:
`ui_font_fallbacks`, `buffer_font_fallbacks`, and
`terminal.font_fallbacks`.(#5180, #5055).
---------
Co-authored-by: Junkui Zhang <364772080@qq.com>
Closes https://github.com/zed-industries/zed/issues/4565
To fix issues with code blocks' parsing in Markdown, a
tree-sitter-markdown library update is needed.
But `tree_sitter::language` is used in many places within core Zed,
which forced more library updates.
Release Notes:
- Updated tree-sitter parsers for core languages
---------
Co-authored-by: Max Brunsfeld <max@zed.dev>
Co-authored-by: Piotr Osiewicz <piotr@zed.dev>
Note:
- We have disabled all tests that rely on Postgres in the Linux CI. We
only really need to test these once, and as macOS is our team's primary
platform, we'll only enable them on macOS for local reproduction.
- We have disabled all tests that rely on the font metrics. We
standardized on Zed Mono in many fonts, but our CoreText Text System and
Cosmic Text System proved to be very different in effect. We should
revisit if we decide to standardize our text system across platforms
(e.g. using Harfbuzz everywhere)
- Extended the condition timeout significantly. Our CI machines are slow
enough that this is causing spurious errors in random tests.
Release Notes:
- N/A
---------
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Release Notes:
- Improved expand excerpt indicators to allow unidirectional expansion.
Also added the `editor::ExpandExcerptsUp` and
`editor::ExpandExcerptsDown` actions, which can both take a `lines`
parameter. Also added a `expand_excerpt_lines` setting which controls
the default number of lines that the indicators and actions use.
---------
Co-authored-by: conrad <conrad@zed.dev>
This pull request replaces the static `⋯` character we used to insert
when folding a range with a custom render function that return an
`AnyElement`. We plan to use this in the assistant, but for now this
should be behavior-preserving.
Release Notes:
- N/A
---------
Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>
Previously, when highlighting editor rows with a color, we always
auto-scrolled to the first highlighted row. This was useful in contexts
like go-to-line and the outline view. We had an explicit special case
for git diff highlights. Now, part of the `highlight_rows` API, you
specify whether or not you want the autoscroll behavior. This is needed
because we want to highlight rows in the assistant panel, and we don't
want the autoscroll.
Release Notes:
- N/A
Part of https://github.com/zed-industries/zed/issues/8081
To avoid confusion and bugs when converting between various row `u32`'s,
use different types for each.
Further PRs should split `Point` into buffer and multi buffer variants
and make the code more readable.
Release Notes:
- N/A
---------
Co-authored-by: Piotr <piotr@zed.dev>
As an attempt to do things better when showing diff hunks, store diff
base as Rope, not String, to have cheaper clones when the diff base text
is reused, e.g. creating another buffer with the diff base text for hunk
diff expanding.
Release Notes:
- N/A
Part of https://github.com/zed-industries/zed/issues/4523
Added two new actions with the default keybindings
```
"cmd-'": "editor::ToggleHunkDiff",
"cmd-\"": "editor::ExpandAllHunkDiffs",
```
that allow to browse git hunk diffs in Zed:
https://github.com/zed-industries/zed/assets/2690773/9a8a7d10-ed06-4960-b4ee-fe28fc5c4768
The hunks are dynamic and alter on user folds and modifications, or
toggle hidden, if the modifications were not adjacent to the expanded
hunk.
Release Notes:
- Added `editor::ToggleHunkDiff` (`cmd-'`) and
`editor::ExpandAllHunkDiffs` (`cmd-"`) actions to browse git hunk diffs
in Zed
See https://zed.dev/channel/gpui-536
Fixes https://github.com/zed-industries/zed/issues/9010
Fixes https://github.com/zed-industries/zed/issues/8883
Fixes https://github.com/zed-industries/zed/issues/8640
Fixes https://github.com/zed-industries/zed/issues/8598
Fixes https://github.com/zed-industries/zed/issues/8579
Fixes https://github.com/zed-industries/zed/issues/8363
Fixes https://github.com/zed-industries/zed/issues/8207
### Problem
After transitioning Zed to GPUI 2, we started noticing that interacting
with the mouse on many UI elements would lead to a pretty annoying
flicker. The main issue with the old approach was that hover state was
calculated based on the previous frame. That is, when computing whether
a given element was hovered in the current frame, we would use
information about the same element in the previous frame.
However, inspecting the previous frame tells us very little about what
should be hovered in the current frame, as elements in the current frame
may have changed significantly.
### Solution
This pull request's main contribution is the introduction of a new
`after_layout` phase when redrawing the window. The key idea is that
we'll give every element a chance to register a hitbox (see
`ElementContext::insert_hitbox`) before painting anything. Then, during
the `paint` phase, elements can determine whether they're the topmost
and draw their hover state accordingly.
We are also removing the ability to give an arbitrary z-index to
elements. Instead, we will follow the much simpler painter's algorithm.
That is, an element that gets painted after will be drawn on top of an
element that got painted earlier. Elements can still escape their
current "stacking context" by using the new `ElementContext::defer_draw`
method (see `Overlay` for an example). Elements drawn using this method
will still be logically considered as being children of their original
parent (for keybinding, focus and cache invalidation purposes) but their
layout and paint passes will be deferred until the currently-drawn
element is done.
With these changes we also reworked geometry batching within the
`Scene`. The new approach uses an AABB tree to determine geometry
occlusion, which allows the GPU to render non-overlapping geometry in
parallel.
### Performance
Performance is slightly better than on `main` even though this new
approach is more correct and we're maintaining an extra data structure
(the AABB tree).
Release Notes:
- Fixed a bug that was causing popovers to flicker.
---------
Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Thorsten <thorsten@zed.dev>
Antonio Scandurra