Select tool: a multi-click selects only on the frame egui reports it, so a cleared selection (or the highlighter's marked word) isn't selected again

The highlighter test now clicks at a human pace, with frames in between, which is what exposed it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/ui-egui/src/canvas.rs

@@ -2684,7 +2684,10 @@ pub fn document_area(app: &mut PdfCraftApp, index: usize, ui: &mut egui::Ui) {
                         view.clicks = release_clicks;
                     }
                     let clicks = if view.clicks > 2 && tool != QuickTool::Select { 1 } else { view.clicks };
-                    if clicks >= 2 && over_text {
+                    // Only on the frame egui reports the multi-click: `view.clicks` outlives it, and
+                    // acting on every frame re-selected the word as soon as a selection was cleared
+                    // (a highlight made by the double-click left its word selected).
+                    if release_clicks > 0 && clicks >= 2 && over_text {
                         if view.selection.is_none() {
                             let span = text.nearest(vx, vy).and_then(|a| match clicks {
                                 2 => text.word_at(a),

crates/ui-egui/tests/ui_group/text_select.rs

@@ -77,6 +77,16 @@ fn quick_clicks_with_the_highlighter_mark_only_the_word() {
     let (mut h, at) = harness(|app| assert!(app.execute("comment.highlight")));
     for _ in 0..4 {
         click(&mut h, at);
+        // The double-click's highlight re-renders the page; give its text layer up to 8 frames
+        // to come back (still well inside egui's 0.3 s multi-click window at 1/60 s a frame), so
+        // a loaded machine doesn't make the later clicks land on a page with no text yet.
+        for _ in 0..8 {
+            if !h.state().render_pending() {
+                break;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(20));
+            h.run_steps(1);
+        }
     }
     h.run_steps(3);
     // Under load the mark can land a few frames later; wait for it (egui's clock is fixed per