DB & Dev Tools · Databases: narrow boxes scroll or wrap; the form's rules tested

QueryPlanViewer's step column takes the label width and the table
scrolls sideways past its least width; TableStructureEditor's rows
stretch to a least width that scrolls sideways; RedisKeyBrowser's
columns wrap below each other inside 280px. The form's rules are pure,
parse_port and ready, with unit tests; gpui tests cover saving, a new
connection refilling the form, another engine bringing its port, and a
press on a row's button leaving the row alone.

examples/gallery/pages/devtools/db.rs

@@ -270,8 +270,7 @@ pub fn structure(window: &mut Window, cx: &mut App) -> impl IntoElement + use<>
             .flex_wrap()
             .gap_6()
             .child(
-                div().w(px(620.)).child(
-                    TableStructureEditor::new("devtools-structure", fields)
+                div().w(px(660.)).child(TableStructureEditor::new("devtools-structure", fields)
                         .on_change(move |next, _, cx| change(&edited, cx, |build| build.fields = next)),
                 ),
             )