Forward Ctrl to the device

Now that Meta is used for scrcpy shortcuts, Ctrl can be forwarded to the
device.

This allows to trigger Android shortcuts.

Fixes #555 <#555>

app/src/event_converter.c

@@ -92,6 +92,8 @@ convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod,
         MAP(SDLK_LEFT,         AKEYCODE_DPAD_LEFT);
         MAP(SDLK_DOWN,         AKEYCODE_DPAD_DOWN);
         MAP(SDLK_UP,           AKEYCODE_DPAD_UP);
+        MAP(SDLK_LCTRL,        AKEYCODE_CTRL_LEFT);
+        MAP(SDLK_RCTRL,        AKEYCODE_CTRL_RIGHT);
     }
 
     if (!(mod & (KMOD_NUM | KMOD_SHIFT))) {

app/src/input_manager.c

@@ -263,16 +263,20 @@ input_manager_process_key(struct input_manager *im,
     bool alt = event->keysym.mod & (KMOD_LALT | KMOD_RALT);
     bool meta = event->keysym.mod & (KMOD_LGUI | KMOD_RGUI);
 
-    if (alt || ctrl) {
-        // No shortcuts involve Alt or Ctrl, and they are not forwarded to the
-        // device
+    if (alt) {
+        // No shortcuts involve Alt, and it is not forwarded to the device
         return;
     }
 
     struct controller *controller = im->controller;
 
     // Capture all Meta events
     if (meta) {
+        if (ctrl) {
+            // No shortcuts involve Ctrl+Meta
+            return;
+        }
+
         SDL_Keycode keycode = event->keysym.sym;
         bool down = event->type == SDL_KEYDOWN;
         int action = down ? ACTION_DOWN : ACTION_UP;