PluginIssue: Add too MIDI in/out channels

include/PluginIssue.h

@@ -36,6 +36,8 @@ enum PluginIssueType
 	unknownPortType,
 	tooManyInputChannels,
 	tooManyOutputChannels,
+	tooManyMidiInputChannels,
+	tooManyMidiOutputChannels,
 	noOutputChannel,
 	portHasNoDef,
 	portHasNoMin,

src/core/PluginIssue.cpp

@@ -38,6 +38,10 @@ const char *PluginIssue::msgFor(const PluginIssueType &it)
 			return "too many audio input channels";
 		case tooManyOutputChannels:
 			return "too many audio output channels";
+		case tooManyMidiInputChannels:
+			return "too many MIDI input channels";
+		case tooManyMidiOutputChannels:
+			return "too many MIDI output channels";
 		case noOutputChannel:
 			return "no audio output channel";
 		case portHasNoDef: