IDE: Fix missing highlighted element in diagrams when using GTK3

- wx's logical function does not work on gtk3, and highlighting relies on it
- skipping logical funciion at all "works" but this now makes highlight opaque
- no easy fix for highlight transparency since emulated with AND Wx logical function
+ added other highlight related cosmetic fix.

#!/bin/bash

set -e

echo "Building docker image"
docker build \
    --build-arg UID=$(id -u) \
    --build-arg GID=$(id -g) \
    -t beremiz_sikuli .