wayland: text input protocol uses UTF-8 encoding (#415)

* wayland: text input protocol uses UTF-8 encoding The Wayland text input protocol sends text in UTF-8 encoding, but the Flutter TextInputModel expects UTF-16. This adds the missing conversion from UTF-8 to UTF-16. Signed-off-by: Sebastian Urban <surban@surban.net> * Add Sebastian Urban to AUTHORS --------- Signed-off-by: Sebastian Urban <surban@surban.net>

Author: surban

AUTHORS

@@ -13,3 +13,4 @@ Makoto Sato (makoto.sato@atmark-techno.com)
 Yunhao Tian (t123yh@outlook.com)
 Luke Howard <lukeh@padl.com>
 Stanislav Shmarov <github@snarpix.com>
+Sebastian Urban <surban@surban.net>

src/flutter/shell/platform/linux_embedded/window/elinux_window_wayland.cc

@@ -13,6 +13,8 @@
 #include <algorithm>
 #include <cassert>
 #include <cmath>
+#include <codecvt>
+#include <locale>
 #include <unordered_map>
 
 #include "flutter/shell/platform/linux_embedded/logger.h"
@@ -748,7 +750,10 @@ const zwp_text_input_v1_listener ELinuxWindowWayland::kZwpTextInputV1Listener =
 
  auto self = reinterpret_cast<ELinuxWindowWayland*>(data);
  if (self->binding_handler_delegate_ && strlen(text)) {
- self->binding_handler_delegate_->OnVirtualKey(text[0]);
+ std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>
+ utf8_converter;
+ std::u16string utf16_text = utf8_converter.from_bytes(text);
+ self->binding_handler_delegate_->OnVirtualKey(utf16_text[0]);
  }
  if (self->zwp_text_input_v1_) {
  zwp_text_input_v1_reset(self->zwp_text_input_v1_);
@@ -779,7 +784,10 @@ const zwp_text_input_v1_listener ELinuxWindowWayland::kZwpTextInputV1Listener =
  // commit_string is notified only when the space key is pressed.
  auto self = reinterpret_cast<ELinuxWindowWayland*>(data);
  if (self->binding_handler_delegate_ && strlen(text)) {
- self->binding_handler_delegate_->OnVirtualKey(text[0]);
+ std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>
+ utf8_converter;
+ std::u16string utf16_text = utf8_converter.from_bytes(text);
+ self->binding_handler_delegate_->OnVirtualKey(utf16_text[0]);
  }
  // If there is no input data, the backspace key cannot be used,
  // so set dummy data.
@@ -895,7 +903,10 @@ const zwp_text_input_v3_listener ELinuxWindowWayland::kZwpTextInputV3Listener =
 
  auto self = reinterpret_cast<ELinuxWindowWayland*>(data);
  if (self->binding_handler_delegate_ && strlen(text)) {
- self->binding_handler_delegate_->OnVirtualKey(text[0]);
+ std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>
+ utf8_converter;
+ std::u16string utf16_text = utf8_converter.from_bytes(text);
+ self->binding_handler_delegate_->OnVirtualKey(utf16_text[0]);
  }
  },
  .delete_surrounding_text = [](void* data,