Austin Cummings 4a1ed927ff Fix preview button acting on the focused editor instead of its own pane (#61218)
Closes #54951

## Problem

The quick action bar's preview button (markdown, SVG, and CSV behind the
feature flag) resolved everything through `workspace.active_item()` —
the globally *focused* item — instead of the item of the pane the button
sits in. With `A.md` in the left pane and focus in `B.md` in the right
pane:

- Clicking the eye button in **A.md's** toolbar opened a preview of
**B.md**, in the right pane.
- Focusing a non-previewable file (e.g. `B.sh`) in one pane hid the
button in **every** pane's toolbar, making `A.md` unpreviewable by
mouse.

Clicking the button dispatched the `OpenPreview` action, whose
workspace-level handler re-resolved the focused editor — so a click on a
specific pane's toolbar was functionally identical to pressing the
keybinding, discarding the pane the click happened in.

## Fix

Make the flow pane-explicit end to end:

- **Visibility:** each pane's `QuickActionBar` resolves the preview type
from its own `active_item` (set via `set_active_pane_item`) instead of
the workspace's focused item.
- **Click:** no more action dispatch. The handler resolves its pane via
`Workspace::pane_for` and calls new pane-explicit helpers —
`open_preview_in_pane` / `open_preview_to_the_side_of_pane` — extracted
from the action-handler bodies in all three preview crates. Keyboard
actions keep their focus-based semantics and route through the same
helpers with the focused editor and active pane.
- **Alt-click** (open in split) now splits relative to the button's pane
via the new `Workspace::adjacent_pane_of` (the existing `adjacent_pane`
delegates to it).

Notably *not* done: focusing the button's pane and re-dispatching the
action. `workspace.active_pane` only updates when pane focus-in
listeners fire at the end of the next draw, while dispatched actions run
before it — the handler would still read the stale pane.

## Additional changes

- Existing-preview lookup now happens **before** view construction,
instead of building a full preview view (subscriptions, initial parse)
and discarding it when one already exists.
- The `focus` flag now also applies to the activate-existing branch, so
open-to-the-side never steals focus — previously the *first* invocation
left focus in the editor but a *repeat* invocation focused the existing
preview (and cancelled collaborator-following in that pane as a side
effect).
- SVG handlers no longer double-check `is_svg_file`; CSV handlers reuse
`resolve_active_item_as_csv_editor` instead of inlining it;
`is_markdown_file` takes `&App` instead of a needless `&mut Context<V>`.

## Testing

- New regression test
`preview_opens_for_the_given_pane_not_the_focused_editor` reproducing
the issue's setup (two panes, focus in the second, preview invoked for
the first pane's editor), asserting the preview opens in the invoking
pane bound to that pane's editor with the focused pane untouched.
- Markdown/SVG/CSV preview suites and the full `workspace` suite pass;
`./script/clippy` is clean.

Release Notes:

- Fixed the preview button (Markdown/SVG) previewing the focused file
instead of the file in the pane the button belongs to when multiple
panes are open
2026-07-20 04:08:28 +00:00
2026-01-22 23:57:26 +05:30
WIP
2023-12-14 09:25:14 -07:00
2026-04-29 10:27:47 +00:00
2025-02-04 09:02:59 -05:00
2025-10-27 13:27:59 -04:00
2026-06-27 15:06:29 +00:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00
2026-04-29 10:27:47 +00:00

Zed

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