Lazy loads language models.

Source/AppDelegate.swift

@@ -153,7 +153,6 @@ class AppDelegate: NSObject, NSApplicationDelegate, NonModalAlertWindowControlle
 
     func applicationDidFinishLaunching(_ notification: Notification) {
         LanguageModelManager.setupDataModelValueConverter()
-        LanguageModelManager.loadDataModels()
         LanguageModelManager.loadUserPhrases()
         LanguageModelManager.loadUserPhraseReplacement()
 

Source/InputMethodController.swift

@@ -127,6 +127,7 @@ class McBopomofoInputMethodController: IMKInputController {
 
     override func setValue(_ value: Any!, forTag tag: Int, client: Any!) {
         let newInputMode = InputMode(rawValue: value as? String ?? InputMode.bopomofo.rawValue)
+        LanguageModelManager.loadDataModel(newInputMode)
         if keyHandler.inputMode != newInputMode {
             UserDefaults.standard.synchronize()
             // Remember to override the keyboard layout again -- treat this as an activate event.

Source/LanguageModelManager.h

@@ -22,12 +22,14 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 
 #import <Foundation/Foundation.h>
+#import "KeyHandler.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface LanguageModelManager : NSObject
 
 + (void)loadDataModels;
++ (void)loadDataModel:(InputMode)mode;
 + (void)loadUserPhrases;
 + (void)loadUserPhraseReplacement;
 + (void)setupDataModelValueConverter;

Source/LanguageModelManager.mm

@@ -60,6 +60,16 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
     LTLoadLanguageModelFile(@"data-plain-bpmf", gLanguageModelPlainBopomofo);
 }
 
++ (void)loadDataModel:(InputMode)mode
+{
+    if ([mode isEqualToString:InputModeBopomofo]) {
+        LTLoadLanguageModelFile(@"data", gLanguageModelMcBopomofo);
+    }
+    if ([mode isEqualToString:InputModePlainBopomofo]) {
+        LTLoadLanguageModelFile(@"data-plain-bpmf", gLanguageModelPlainBopomofo);
+    }
+}
+
 + (void)loadUserPhrases
 {
     gLanguageModelMcBopomofo.loadUserPhrases([[self userPhrasesDataPathMcBopomofo] UTF8String], [[self excludedPhrasesDataPathMcBopomofo] UTF8String]);