Fix keyboard shortcut

[james-lawrence]

turned out really easy to do the codepoint in go. I'm still in the processing of testing this code in my app. but if someone wants to take it for a spin, that'd be helpful.

int32(rune("f"))

that being said, currently my test doesn't work. some compilation issue I do not yet understand.

but here is how i generated the test:

package main

// #include "key-codepoint.cpp"
import "C"

import (
	"log"
	"strconv"

	"github.com/go-flutter-desktop/go-flutter"
)

func main() {
	examples := []rune("񃍃Cƅ񊘐f@~΍خ4vʤΌ񩂅-~ä诙ϝ٧婲Ћ鯄YT񯪪ψʈ»qѶƿւÃ槼ڧ󯺞덉!0羲򦜔🷚穰B룅챧ښшP鼥>򑽇ݚɴyţS°�鋯膴׾򾹭Ӿ𡕟Ϋl𙰳ﭼ򌚰Ѩ୺俐ֿ򙰳Ӱ9�榾Ȱsٶӎ隣#|ٯɕ򬠰#󤽹߹򱘂^C¢:Ȣ鎻㿸𗢴=M赧󐲯U̾32ҔަMߢ}.Ǒʸ󎋀�݂7񒳙콞dס󌢒򭂦䮁򔎩󭾆󡫚٦񈥑狳,_wܘ𯹸ق󾖘ӔȻWᓹ􉤀ۿҍF侹냊Ʌ>")
	result := make([]int32, 0, len(examples))
	for _, c := range examples {
		result = append(result, flutter.CodePointFromGLFWKey(c))
		log.Println(c, "==", codePointTest(c), "=", c == codePointTest(c) && c == flutter.CodePointFromGLFWKey(c), "(", flutter.CodePointFromGLFWKey(c), ")")

		if !(c == codePointTest(c) && c == flutter.CodePointFromGLFWKey(c)) {
			panic("invalid conversion")
		}
	}

	log.Println("results:")
	s := ""
	for _, i := range result {
		s += strconv.Itoa(int(i)) + ", "
	}
	log.Println("[", s, "]")
}

func codePointTest(r rune) (result int32) {
	return int32(C.GetUTF32CodePointFromGLFWKey2(C.CString(string(r))))
}

[pchampio]

@james-lawrence thanks for your PR!
I'm applying other changes, regarding key-events.
Since it affect text navigation, it's a bit hard.

I did use some code of yours, bit I wont merge it using this PR.

[james-lawrence]

;) i was just testing my changes. seems fine do you have a PR I can look at and use locally?

[pchampio]

I'll update #338 in a second