fix(ui): the added-text editor keeps the box's alignment

Opening a centred or right-aligned Add text box drew its text at the left
edge, a layout the box never had, and Ctrl+Z inside the box (which goes to
the text, not the document) left it showing that way. The editor now lays
the text out with the box's alignment. Justified text is still shown
left-aligned while editing (TextEdit can't justify).

crates/ui-egui/src/content_ui.rs

@@ -560,6 +560,13 @@ pub(crate) fn editor(ctx: &egui::Context, view: &mut DocView, info: &DocInfo, ad
             // The box is white in every theme, so the caret must not follow the theme (pale in dark mode) (#655).
             ui.visuals_mut().text_cursor.stroke.color = crate::edit_text_ui::caret_color_on(Color32::WHITE);
             let [cr, cg, cb] = t.style.color.map(|v| (v.clamp(0.0, 1.0) * 255.0) as u8);
+            // Laid out as the page draws it, so opening the box doesn't show it realigned.
+            // shortcut: justified text is shown left-aligned here (TextEdit can't justify), until the editor gets its own layouter.
+            let halign = match t.style.align {
+                pdfcraft_engine::TextAlign::Center => egui::Align::Center,
+                pdfcraft_engine::TextAlign::Right => egui::Align::Max,
+                pdfcraft_engine::TextAlign::Left | pdfcraft_engine::TextAlign::Justify => egui::Align::Min,
+            };
             ui.horizontal_top(|ui| {
                 ui.spacing_mut().item_spacing.x = 4.0;
                 let resp = ui.add(
@@ -567,6 +574,7 @@ pub(crate) fn editor(ctx: &egui::Context, view: &mut DocView, info: &DocInfo, ad
                         .font(font)
                         .desired_width(r.width().max(60.0))
                         .desired_rows(1)
+                        .horizontal_align(halign)
                         .background_color(if background_ready { Color32::TRANSPARENT } else { Color32::WHITE })
                         .text_color(Color32::from_rgb(cr, cg, cb))
                         .hint_text(tl!("Type text"))

crates/ui-egui/tests/it/content.rs

@@ -715,6 +715,28 @@ fn format_text_panel_sets_alignment_and_lists_planned_controls_disabled() {
 }
 
 /// Where a mode bar tab is, by its label.
+/// Opening right-aligned added text to edit it shows it right-aligned, as the page does, not at
+/// the box's left edge, where it never was.
+#[test]
+fn the_text_editor_keeps_the_boxs_alignment() {
+    let _gpu = gpu();
+    let mut h = harness();
+    let rect = [40.0, 195.0, 240.0, 210.0];
+    let text = pdfcraft_engine::AddedText { rect, text: "Hi".into(), align: pdfcraft_engine::TextAlign::Right, ..Default::default() };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text }));
+    assert!(h.state_mut().execute("edit.text"));
+    h.run_steps(3);
+    let point = at(&h, 200.0, 195.0);
+    click(&mut h, point);
+    assert_eq!(h.state().views[0].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    h.run_steps(3);
+    let r = item_on_screen(&h, rect);
+    let pixels = h.render().unwrap();
+    let left = ink(&pixels, egui::Rect::from_min_max(r.min, pos2(r.center().x, r.max.y)));
+    let right = ink(&pixels, egui::Rect::from_min_max(pos2(r.center().x, r.min.y), r.max));
+    assert!(left == 0 && right > 20, "the text is drawn at the right ({left} dark pixels left, {right} right)");
+}
+
 fn mode_tab(h: &Harness<'static, PdfCraftApp>, label: &str) -> egui::Rect {
     h.get_all_by_role_and_label(egui::accesskit::Role::Button, label).map(|n| n.rect()).find(|r| r.bottom() < 120.0).expect("a mode tab")
 }