Fix passing mouse events to Grid items

Events are now only passed to the item under the mouse.

CHANGELOG

@@ -7,6 +7,7 @@ v1.5.6 (WIP)
 - Add DropDown.SetAlwaysDrawDropDownSymbol (DropDown symbols are now shown only when focused by default)
 - Add DropDown.SetDropDownOpenSymbolRune
 - Fix TextView always visible scroll bar not appearing when empty
+- Fix passing mouse events to Grid items (events are now only passed to the item under the mouse)
 - Draw additional accents when rendering a list divider
 - Update Application.Draw and Application.QueueUpdateDraw to accept one or more
 primitives to draw instead of the whole screen

grid.go

@@ -702,8 +702,15 @@ func (g *Grid) MouseHandler() func(action MouseAction, event *tcell.EventMouse,
 			return false, nil
 		}
 
-		// Pass mouse events along to the first child item that takes it.
+		// Pass mouse events along to the first child item under the mouse that consumes it.
+		x, y := event.Position()
 		for _, item := range g.items {
+			rectX, rectY, width, height := item.Item.GetRect()
+			inRect := x >= rectX && x < rectX+width && y >= rectY && y < rectY+height
+			if !inRect {
+				continue
+			}
+
 			consumed, capture = item.Item.MouseHandler()(action, event, setFocus)
 			if consumed {
 				return

textview.go

@@ -1060,9 +1060,18 @@ func (t *TextView) Draw(screen tcell.Screen) {
 		if !showVerticalScrollBar {
 			return
 		}
+
+		items := len(t.index)
 		cursor := int(float64(len(t.index)) * (float64(t.lineOffset) / float64(len(t.index)-height)))
+
+		// Render cursor at the bottom when tracking end
+		if t.trackEnd && items <= height {
+			items = height + 1
+			cursor = height
+		}
+
 		for printed := 0; printed < height; printed++ {
-			RenderScrollBar(screen, t.scrollBarVisibility, x+width, y+printed, height, len(t.index), cursor, printed, t.hasFocus, t.scrollBarColor)
+			RenderScrollBar(screen, t.scrollBarVisibility, x+width, y+printed, height, items, cursor, printed, t.hasFocus, t.scrollBarColor)
 		}
 	}()