jesseduffield.lazygit/pkg/gui
Stefan Haller 3b6568cf9f Preserve the diff scroll and selection when the context size changes
Increasing or decreasing the diff context size (the `{`/`}` keybindings)
re-renders the diff with a different `git diff -U<n>` command. Because the
command key changes, the render reset the main view to the top — losing the
spot the user was reading, which is exactly the spot the context change is
about.

Preserve it instead, reusing the identity-based restore built for the escape
path. This is its sibling consumer: capture the lines around the anchor (the
selection, or the top visible line when there's none) as restore candidates,
and after the re-render land on the nearest one that survived, put back at the
same screen row. Prefer the anchor line itself, falling back outward only when
it didn't survive: a context line vanishes when the context size shrinks,
whereas additions and deletions always survive, so expansion stops at the
first change line in each direction and the candidate list always contains a
survivor. Landing on the nearest survivor keeps scrolling to a minimum, and a
context line that is still in the patch stays put (or stays selected).

This generalizes the shared restore helper to take a prioritized candidate
list (the escape path passes a single candidate). It covers the focused main
view and every side panel's diff, since they all render into the same "main"
view through the same path. A showing selection is re-established on the landed
line; otherwise the view stays in scroll mode.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-08-08 12:58:59 +02:00
..
context WIP FocusedMainViewSnapshot approach 2026-08-08 12:58:59 +02:00
controllers Preserve the diff scroll and selection when the context size changes 2026-08-08 12:58:59 +02:00
filetree Make the conflict marker size a parameter of our marker matching 2026-08-08 12:43:42 +02:00
mergeconflicts Recognize conflict markers that have no label 2026-08-08 12:43:42 +02:00
modes Make Commit.Hash a getter for an unexported hash field 2025-04-29 14:57:15 +02:00
patch_exploring Recover diff-line identity by parsing the buffer, behind a swappable seam 2026-08-08 12:58:59 +02:00
popup Decouple hiding the working tree state from blocking input 2026-08-05 17:29:20 +02:00
presentation Show a Github PR's combined checks state in branches list and main view 2026-08-02 13:06:21 +02:00
services/custom_commands Remove the RefreshMode field 2026-07-17 12:32:32 +02:00
status Render the app status in a single background render loop 2026-07-17 15:55:01 +02:00
style Modernize all codes 2025-11-15 10:46:23 +01:00
types Preserve the diff scroll and selection when the context size changes 2026-08-08 12:58:59 +02:00
background.go Read the gui's per-repo pointers on the UI thread in background routines 2026-07-20 17:07:39 +02:00
command_log_panel.go Adapt links 2026-07-31 08:42:51 +02:00
context.go Bump gocui (and tcell) 2025-12-23 16:49:16 +01:00
context_config.go Remove some unused code 2025-07-08 15:14:45 +02:00
controllers.go Restore the focused main view by patch identity on escape 2026-08-08 12:58:59 +02:00
dummies.go Move NewDummyCommon to pkg/common 2025-05-06 09:43:26 +02:00
editors.go Capture suggestions inputs on the UI thread 2026-07-17 12:35:54 +02:00
extras_panel.go Rename Key to Keys in Binding, KeybindingsOpts, and MenuItem 2026-05-25 15:18:18 +02:00
global_handlers.go Read lines based on scroll position instead of a fixed per-notch delta 2026-07-09 09:32:35 +02:00
gui.go Replace gui.showSelectionInFocusedMainView config with on-demand selection 2026-08-08 12:58:59 +02:00
gui_common.go Add RefreshBlockingInput to buffer keypresses until a refresh has landed 2026-07-22 08:31:11 +02:00
gui_driver.go Keep the destination visible while commits move 2026-07-31 08:37:28 +02:00
information_panel.go Rename ModeStatus.Description to InfoLabel 2025-08-14 17:59:38 +02:00
keybindings.go Fold remaining alt bindings into their main fields 2026-05-25 15:32:47 +02:00
layout.go Don't scroll a view up to fill blank space while its content is loading 2026-08-08 12:58:59 +02:00
main_panels.go Reset other main views' scroll after copying content, not before 2026-08-08 12:58:59 +02:00
menu_panel.go Fold remaining alt bindings into their main fields 2026-05-25 15:32:47 +02:00
options_map.go Cleanup: filter out empty keybindings earlier 2026-05-28 19:26:43 +02:00
pty.go Reset the scroll to the top at first paint, not when the task starts 2026-08-08 12:58:59 +02:00
pty_test.go Prevent stale index.lock files from diffs rendered through a pty on Windows 2026-08-04 06:53:53 +02:00
recent_repos_panel.go Remove unused field gui.IsNewRepo 2024-12-01 10:44:26 +01:00
side_panels.go Assign the transient contexts' initial windows from the side panel config 2026-07-17 12:07:24 +02:00
side_panels_test.go Assign the transient contexts' initial windows from the side panel config 2026-07-17 12:07:24 +02:00
tasks_adapter.go Reset the scroll to the top at first paint, not when the task starts 2026-08-08 12:58:59 +02:00
tasks_adapter_test.go Never hand NewCmdTask a nil reader when a command fails to start 2026-07-23 17:31:26 +02:00
test_mode.go Dump goroutine stacks when the test watchdog fires 2026-07-20 14:26:25 +02:00
test_timeout_norace.go Scale the integration test watchdog up under the race detector 2026-07-20 14:26:25 +02:00
test_timeout_race.go Scale the integration test watchdog up under the race detector 2026-07-20 14:26:25 +02:00
view_helpers.go Restore the focused main view by patch identity on escape 2026-08-08 12:58:59 +02:00
views.go Clear tab strips on views that are no longer tabs 2026-06-23 14:15:18 +02:00