fix(input): windows: mouse mode flag

We need to enable mouse mode on Windows on demand. This is done by
adding a new flag to the input driver and passing it to the cancelreader
to enable mouse mode.

Related: charmbracelet/bubbletea#1313

input/cancelreader_other.go

@@ -9,6 +9,6 @@ import (
 	"github.com/muesli/cancelreader"
 )
 
-func newCancelreader(r io.Reader) (cancelreader.CancelReader, error) {
+func newCancelreader(r io.Reader, _ int) (cancelreader.CancelReader, error) {
 	return cancelreader.NewReader(r)
 }

input/cancelreader_windows.go

@@ -22,7 +22,7 @@ type conInputReader struct {
 
 var _ cancelreader.CancelReader = &conInputReader{}
 
-func newCancelreader(r io.Reader) (cancelreader.CancelReader, error) {
+func newCancelreader(r io.Reader, flags int) (cancelreader.CancelReader, error) {
 	fallback := func(io.Reader) (cancelreader.CancelReader, error) {
 		return cancelreader.NewReader(r)
 	}
@@ -46,11 +46,16 @@ func newCancelreader(r io.Reader) (cancelreader.CancelReader, error) {
 		return fallback(r)
 	}
 
-	originalMode, err := prepareConsole(conin,
-		windows.ENABLE_MOUSE_INPUT,
+	modes := []uint32{
 		windows.ENABLE_WINDOW_INPUT,
 		windows.ENABLE_EXTENDED_FLAGS,
-	)
+	}
+
+	if flags&FlagMouseMode != 0 {
+		modes = append(modes, windows.ENABLE_MOUSE_INPUT)
+	}
+
+	originalMode, err := prepareConsole(conin, modes...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to prepare console input: %w", err)
 	}

input/driver.go

@@ -67,7 +67,7 @@ type Reader struct {
 //	}
 func NewReader(r io.Reader, termType string, flags int) (*Reader, error) {
 	d := new(Reader)
-	cr, err := newCancelreader(r)
+	cr, err := newCancelreader(r, flags)
 	if err != nil {
 		return nil, err
 	}

input/parse.go

@@ -83,6 +83,10 @@ const (
 	// Key definitions come from Terminfo, this flag is only useful when
 	// FlagTerminfo is not set.
 	FlagFKeys
+
+	// When this flag is set, the driver will enable mouse mode on Windows.
+	// This is only useful on Windows and has no effect on other platforms.
+	FlagMouseMode
 )
 
 // Parser is a parser for input escape sequences.