Add option to always send scancodes

Default is enabled to match v0.19.1 behavior

Fixes #1233

src/config.cpp

@@ -441,6 +441,7 @@ namespace config {
     true,  // keyboard enabled
     true,  // mouse enabled
     true,  // controller enabled
+    true,  // always send scancodes
   };
 
   sunshine_t sunshine {
@@ -1039,6 +1040,8 @@ namespace config {
     bool_f(vars, "keyboard", input.keyboard);
     bool_f(vars, "controller", input.controller);
 
+    bool_f(vars, "always_send_scancodes", input.always_send_scancodes);
+
     int port = sunshine.port;
     int_f(vars, "port"s, port);
     sunshine.port = (std::uint16_t) port;

src/config.h

@@ -109,6 +109,8 @@ namespace config {
     bool keyboard;
     bool mouse;
     bool controller;
+
+    bool always_send_scancodes;
   };
 
   namespace flag {

src/platform/windows/input.cpp

@@ -350,7 +350,9 @@ namespace platf {
     auto &ki = i.ki;
 
     // If the client did not normalize this VK code to a US English layout, we can't accurately convert it to a scancode.
-    if (!(flags & SS_KBE_FLAG_NON_NORMALIZED) && modcode != VK_LWIN && modcode != VK_RWIN && modcode != VK_PAUSE && raw->keyboard_layout != NULL) {
+    bool send_scancode = !(flags & SS_KBE_FLAG_NON_NORMALIZED) || config::input.always_send_scancodes;
+
+    if (send_scancode && modcode != VK_LWIN && modcode != VK_RWIN && modcode != VK_PAUSE && raw->keyboard_layout != NULL) {
       // For some reason, MapVirtualKey(VK_LWIN, MAPVK_VK_TO_VSC) doesn't seem to work :/
       ki.wScan = MapVirtualKeyEx(modcode, MAPVK_VK_TO_VSC, raw->keyboard_layout);
     }