Support multiline tea.Println() messages

standard_renderer.go

@@ -173,19 +173,18 @@ func (r *standardRenderer) flush() {
 	skipLines := make(map[int]struct{})
 	flushQueuedMessages := len(r.queuedMessageLines) > 0 && !r.altScreenActive
 
-	// Add any queued messages to this render
-	if flushQueuedMessages {
-		newLines = append(r.queuedMessageLines, newLines...)
-		r.queuedMessageLines = []string{}
-	}
-
 	// Clear any lines we painted in the last render.
 	if r.linesRendered > 0 {
 		for i := r.linesRendered - 1; i > 0; i-- {
-			// If the number of lines we want to render hasn't increased and
-			// new line is the same as the old line we can skip rendering for
-			// this line as a performance optimization.
-			if (len(newLines) <= len(oldLines)) && (len(newLines) > i && len(oldLines) > i) && (newLines[i] == oldLines[i]) {
+			// if we are clearing queued messages, we want to clear all lines, since
+			// printing messages allows for native terminal word-wrap, we
+			// don't have control over the queued lines
+			if flushQueuedMessages {
+				out.ClearLine()
+			} else if (len(newLines) <= len(oldLines)) && (len(newLines) > i && len(oldLines) > i) && (newLines[i] == oldLines[i]) {
+				// If the number of lines we want to render hasn't increased and
+				// new line is the same as the old line we can skip rendering for
+				// this line as a performance optimization.
 				skipLines[i] = struct{}{}
 			} else if _, exists := r.ignoreLines[i]; !exists {
 				out.ClearLine()
@@ -215,6 +214,16 @@ func (r *standardRenderer) flush() {
 		skipLines[k] = v
 	}
 
+	if flushQueuedMessages {
+		// Dump the lines we've queued up for printing
+		for _, line := range r.queuedMessageLines {
+			_, _ = out.WriteString(line)
+			_, _ = out.WriteString("\r\n")
+		}
+		// clear the queued message lines
+		r.queuedMessageLines = []string{}
+	}
+
 	// Paint new lines
 	for i := 0; i < len(newLines); i++ {
 		if _, skip := skipLines[i]; skip {