Fix chart drawing tools: place once per click, let tooltip pass clicks through

chart/candlestick_chart.go

@@ -67,6 +67,7 @@ type mktCore struct {
 	candles  []Candle
 	view     *MarketView
 	from, to int
+	act      int // keyboard or click activation, mark plus one; zero is none
 	lo, hi   float64
 	base     float64 // percent mode divides by this close; 0 is prices
 	dec      int
@@ -277,9 +278,7 @@ func (m *mktCore) spec() ChartSpec {
 	}
 	if d := m.opts.Drawings; d != nil {
 		spec.Activate = func(i int) {
-			if !d.Locked && d.Tool != ToolSelect {
-				d.place(m, DrawingPoint{m.candles[i].Time, m.candles[i].Close})
-			}
+			m.act = i + 1
 		}
 	}
 	spec.Readout = m.readout

chart/chart_tooltip.go

@@ -47,7 +47,7 @@ func ChartTooltip(c *ui.Context, x, y float32, lines []ChartTooltipLine) *ui.Ele
 	}
 	var tip *ui.Element
 	ui.Overlay(c, func() {
-		tip = ui.Column(c).Absolute().Left(left).Top(top).Size(w, h).Role(ui.RoleNone)
+		tip = ui.Column(c).Absolute().Left(left).Top(top).Size(w, h).Role(ui.RoleNone).PassThrough()
 		core.OverlayStyle(c, tip, core.OverlayEnter(c, tip))
 		tip.Children(func() {
 			inner := max(1, w-2*pad)
@@ -60,8 +60,8 @@ func ChartTooltip(c *ui.Context, x, y float32, lines []ChartTooltipLine) *ui.Ele
 				_, lh[i] = c.MeasureText(width, ui.Span{Text: l.Text, Size: size, Weight: chartTipWeight(i)})
 				content += lh[i]
 			}
-			ui.Scroll(c).Fill().Padding(pad).Children(func() {
-				ui.Box(c).Width(inner).Height(content).Shrink(0).Draw(func(p *ui.Painter, r ui.Rect) {
+			ui.Scroll(c).Fill().Padding(pad).PassThrough().Children(func() {
+				ui.Box(c).Width(inner).Height(content).Shrink(0).PassThrough().Draw(func(p *ui.Painter, r ui.Rect) {
 					at := r.Y
 					for i, l := range lines {
 						tx, width := r.X, inner

chart/market_input.go

@@ -63,6 +63,11 @@ func (m *mktCore) input(plot *ui.Element) {
 	used := false
 	if d := m.opts.Drawings; d != nil {
 		used = d.input(m, plot, g, x, y, over, held, dx, dy)
+		// A click is placed by input at the pointer; only a key press lands here.
+		if i := m.act - 1; i >= 0 && !used && !d.Locked && d.Tool != ToolSelect {
+			d.place(m, DrawingPoint{m.candles[i].Time, m.candles[i].Close})
+			used = true
+		}
 	}
 	if !used {
 		m.alertsKeyboard(plot)