various changes to improve integration tests

vendor/github.com/jesseduffield/gocui/gui.go

@@ -206,6 +206,16 @@ func NewGui(mode OutputMode, supportOverlaps bool, playMode PlayMode, headless b
 		return nil, err
 	}
 
+	if headless || runtime.GOOS == "windows" {
+		g.maxX, g.maxY = g.screen.Size()
+	} else {
+		// TODO: find out if we actually need this bespoke logic for linux
+		g.maxX, g.maxY, err = g.getTermWindowSize()
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	g.outputMode = mode
 
 	g.stop = make(chan struct{})
@@ -225,15 +235,6 @@ func NewGui(mode OutputMode, supportOverlaps bool, playMode PlayMode, headless b
 		}
 	}
 
-	if runtime.GOOS != "windows" {
-		g.maxX, g.maxY, err = g.getTermWindowSize()
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		g.maxX, g.maxY = Screen.Size()
-	}
-
 	g.BgColor, g.FgColor, g.FrameColor = ColorDefault, ColorDefault, ColorDefault
 	g.SelBgColor, g.SelFgColor, g.SelFrameColor = ColorDefault, ColorDefault, ColorDefault
 

vendor/github.com/jesseduffield/gocui/tcell_driver.go

@@ -84,6 +84,10 @@ func (g *Gui) tcellInitSimulation() error {
 	} else {
 		g.screen = s
 		Screen = s
+		// setting to a larger value than the typical terminal size
+		// so that during a test we're more likely to see an item to select in a view.
+		s.SetSize(100, 100)
+		s.Sync()
 		return nil
 	}
 }

vendor/github.com/jesseduffield/gocui/view.go

@@ -1245,6 +1245,9 @@ func (v *View) SelectedLineIdx() int {
 
 // expected to only be used in tests
 func (v *View) SelectedLine() string {
+	if len(v.lines) == 0 {
+		return ""
+	}
 	line := v.lines[v.SelectedLineIdx()]
 	str := lineType(line).String()
 	return strings.Replace(str, "\x00", " ", -1)