Let's assume the user has bound the dead key ^ to a sendInput command
that sends "b". If the user presses the two keys ^a it'll produce "bâ",
despite us marking the key event as handled. We can use `ToUnicodeEx`
to clear such dead keys from the keyboard state and should make use of
that for keybindings. Unfortunately `SetKeyboardState` cannot be used
for this purpose as it doesn't clear the dead key state.
Validation
* Enabled a German keyboard layout
* Added the following two keybindings:
{ "command": { "action": "sendInput", "input": "x" }, "keys": "q" },
{ "command": { "action": "sendInput", "input": "b" }, "keys": "^" }
* Pressed the following keys → ensured that the given text is printed:
* q → x
* ´ → nothing
* a → á
* ^ → b
* a → a (previously this would print: â)
* ´ → nothing
* ^ → b
* a → a (unfortunately we cannot specifically clear only ^)
Closes#5784
4099aacacb