Fix resetting background color via '-'

The primitive background color is now used, rather than the terminal background color.

Resolves #47.

CHANGELOG

@@ -1,6 +1,8 @@
 v1.5.6 (WIP)
 - Draw additional accents when rendering a list divider
 - Update List, Table and TreeView to not handle Tab or Backtab
+- When resetting color with "-" tag, set background color to primitive
+background color, rather than the terminal background color
 
 v1.5.5 (2020-05-24)
 - Fix Application.Suspend by restructuring event loop (queued updates will now only run between draws)

README.md

@@ -67,10 +67,10 @@ func main() {
 ```
 
 Examples are available via [godoc](https://docs.rocketnine.space/code.rocketnine.space/tslocum/cview#pkg-examples)
-and in the "demos" subdirectory.
+and in the [demos](https://code.rocketnine.space/tslocum/cview/src/branch/master/demos) subdirectory.
 
 For a presentation highlighting the features of this package, compile and run
-the program in the "demos/presentation" subdirectory.
+the program in the [demos/presentation](https://code.rocketnine.space/tslocum/cview/src/branch/master/demos/presentation) subdirectory.
 
 ## Documentation
 

textview.go

@@ -1083,7 +1083,7 @@ func (t *TextView) Draw(screen tcell.Screen) {
 	}
 
 	// Draw the buffer.
-	defaultStyle := tcell.StyleDefault.Foreground(t.textColor)
+	defaultStyle := tcell.StyleDefault.Foreground(t.textColor).Background(t.backgroundColor)
 	for line := t.lineOffset; line < len(t.index); line++ {
 		// Are we done?
 		if line-t.lineOffset >= height {