fix: correct DA2 responses for screen and linux term names

Split the combined xterm/screen case in sendDeviceAttributesSecondary
so that screen returns ESC[>83;40003;0c and linux echoes the parameter
followed by c, matching upstream xterm.js behavior.

Fixes #37

Co-authored-by: Ona <no-reply@ona.com>

Author: ona-automations

inputhandler_csi.go

@@ -467,12 +467,14 @@ func (h *InputHandler) sendDeviceAttributesSecondary(params *Params) bool {
 	}
 	tn := h.optionsService.Options.TermName
 	switch {
-	case strings.HasPrefix(tn, "xterm"), strings.HasPrefix(tn, "screen"):
+	case strings.HasPrefix(tn, "xterm"):
 		h.coreService.TriggerDataEvent("\x1b[>0;276;0c", false, false)
 	case strings.HasPrefix(tn, "rxvt-unicode"):
 		h.coreService.TriggerDataEvent("\x1b[>85;95;0c", false, false)
 	case strings.HasPrefix(tn, "linux"):
-		// linux console does not respond to DA2
+		h.coreService.TriggerDataEvent(fmt.Sprintf("%dc", params.Params[0]), false, false)
+	case strings.HasPrefix(tn, "screen"):
+		h.coreService.TriggerDataEvent("\x1b[>83;40003;0c", false, false)
 	}
 	return true
 }

inputhandler_csi_test.go

@@ -649,9 +649,9 @@ func TestDeviceAttributes(t *testing.T) {
 		}{
 			{"xterm_default", "xterm", "\x1b[>c", "\x1b[>0;276;0c"},
 			{"xterm-256color", "xterm-256color", "\x1b[>c", "\x1b[>0;276;0c"},
-			{"screen", "screen", "\x1b[>c", "\x1b[>0;276;0c"},
+			{"screen", "screen", "\x1b[>c", "\x1b[>83;40003;0c"},
 			{"rxvt-unicode", "rxvt-unicode", "\x1b[>c", "\x1b[>85;95;0c"},
-			{"linux_no_response", "linux", "\x1b[>c", ""},
+			{"linux", "linux", "\x1b[>c", "0c"},
 			{"non_zero_param_no_response", "xterm", "\x1b[>1c", ""},
 		}
 		for _, tc := range tests {