1 files changed, 38 insertions, 0 deletions
diff --git a/gui/internal/model/prefs.go b/gui/internal/model/prefs.go
index f5ffee5..9ae79a0 100644
--- a/gui/internal/model/prefs.go
+++ b/gui/internal/model/prefs.go
@@ -112,3 +112,41 @@ func (p Prefs) Save() error {
 	}
 	return os.WriteFile(file, append(data, '\n'), 0o644)
 }
+
+// Display is everything the Settings window can change about the window
+// itself. It deliberately leaves out the divider positions: those are set
+// by dragging, and a settings change must not disturb them. Composing a
+// whole Prefs in the Settings window instead is what used to write
+// PreviewWidth, ListWidth and ListHeight back as zeros, so dragging the
+// panes to taste and then ticking any checkbox threw the panes away.
+type Display struct {
+	Sort          string
+	Layout        string
+	ShowSize      bool
+	ShowAge       bool
+	ShowRule      bool
+	Colours       bool
+	Preview       bool
+	SelectAll     bool
+	PreviewHeight int
+}
+
+// DisplayOf is the part of p the Settings window shows.
+func (p Prefs) DisplayOf() Display {
+	return Display{
+		Sort: p.Sort, Layout: p.Layout,
+		ShowSize: p.ShowSize, ShowAge: p.ShowAge, ShowRule: p.ShowRule,
+		Colours: p.Colours, Preview: p.Preview, SelectAll: p.SelectAll,
+		PreviewHeight: p.PreviewHeight,
+	}
+}
+
+// WithDisplay is p with d applied and everything else - where each divider
+// was left - kept as it was.
+func (p Prefs) WithDisplay(d Display) Prefs {
+	p.Sort, p.Layout = d.Sort, d.Layout
+	p.ShowSize, p.ShowAge, p.ShowRule = d.ShowSize, d.ShowAge, d.ShowRule
+	p.Colours, p.Preview, p.SelectAll = d.Colours, d.Preview, d.SelectAll
+	p.PreviewHeight = d.PreviewHeight
+	return p
+}