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Fix text selection of centered and right-aligned text (#8076)

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* Fixes https://github.com/emilk/egui/issues/8049
* Bug introduced in https://github.com/emilk/egui/pull/7831
This commit is contained in:
Emil Ernerfeldt
2026-04-07 13:29:57 +02:00
committed by lucasmerlin
parent daae4ce652
commit 4e1567cecb
6 changed files with 48 additions and 20 deletions
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20
crates/egui_demo_lib/tests/misc.rs
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@@ -61,21 +61,25 @@ fn test_italics() {
fn test_text_selection() {
let mut results = egui_kittest::SnapshotResults::new();
for (test_idx, drag_start_x) in [0.2_f32, 0.9].into_iter().enumerate() {
let mut harness = Harness::builder().build_ui(|ui| {
let visuals = ui.visuals_mut();
visuals.selection.bg_fill = Color32::LIGHT_GREEN;
visuals.selection.stroke.color = Color32::RED;
for (test_idx, drag_start_x) in [0.2_f32, 0.95].into_iter().enumerate() {
let mut harness = Harness::builder()
.with_pixels_per_point(1.0) // TODO(emilk): why does this test fail with 2.0?
.build_ui(|ui| {
let visuals = ui.visuals_mut();
visuals.selection.bg_fill = Color32::LIGHT_GREEN;
visuals.selection.stroke.color = Color32::RED;
ui.label("Some varied ☺ text :)\nAnd it has a second line!");
});
ui.vertical_centered(|ui| {
ui.label("Some varied ☺ text :)\nAnd it has a second line!\nAnd a third!");
});
});
harness.run();
harness.fit_contents();
// Drag to select text:
let label = harness.get_by_role(Role::Label);
harness.drag_at(label.rect().lerp_inside([drag_start_x, 0.25]));
harness.drop_at(label.rect().lerp_inside([0.6, 0.75]));
harness.drop_at(label.rect().lerp_inside([0.5, 0.75]));
harness.run();
harness.snapshot(format!("text_selection_{test_idx}"));

4
crates/egui_demo_lib/tests/snapshots/demos/Text Layout.png
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@@ -1,3 +1,3 @@
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4
crates/egui_demo_lib/tests/snapshots/text_selection_0.png
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@@ -1,3 +1,3 @@
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4
crates/egui_demo_lib/tests/snapshots/text_selection_1.png
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@@ -1,3 +1,3 @@
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