[Gambas-bugtracker] Bug #1621: ComboBox .Border = False not working ?

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.1621&from=L21haW4-

Martín BELMONTE reported a new bug.

Summary
-------

ComboBox .Border = False not working ?

Type             : Request
Priority         : Low
Gambas version   : Master
Product          : QT4 component


Description
-----------

Hi, I try to change to set combobox .Border = False, it works, the border disappears, but there is something that remains and the ComboBox is not clean (please see the attached picture)
I am using a system with GTK3 on the desktop.
If I configure the project specifically with GTK3, the aspect is as expected (there is no border or anything remnant)
But if I use gb.qt, gb.gtk, gb.gui it does not work well and something is seen at the border of control.

Tanks.


System information
------------------

[System]
Gambas=3.13
OperatingSystem=Linux
Kernel=5.0.0-15-generic
Architecture=x86_64
Distribution=Pop!_OS 19.04
Desktop=POP:GNOME
Theme=Gtk
Language=es_AR.UTF-8
Memory=7849M

[Libraries]
Cairo=libcairo.so.2.11600.0
Curl=libcurl.so.4.5.0
DBus=libdbus-1.so.3.19.9
GStreamer=libgstreamer-1.0.so.0.1590.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2404.4
OpenGL=libGL.so.1.7.0
Poppler=libpoppler.so.85.0.0
QT4=libQtCore.so.4.8.7
QT5=libQt5Core.so.5.12.2
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
CLUTTER_IM_MODULE=xim
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DESKTOP_SESSION=pop
DISPLAY=:1
GB_GUI=gb.qt4
GDMSESSION=pop
GIO_LAUNCHED_DESKTOP_FILE=/usr/share/applications/gambas3.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=2946
GJS_DEBUG_OUTPUT=stderr
GJS_DEBUG_TOPICS=JS ERROR;JS LOG
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
GNOME_SHELL_SESSION_MODE=pop
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK_IM_MODULE=ibus
GTK_MODULES=gail:atk-bridge
HOME=<home>
IM_CONFIG_PHASE=2
LANG=es_AR.UTF-8
LANGUAGE=es_AR.UTF-8
LC_ADDRESS=es_AR.UTF-8
LC_IDENTIFICATION=es_AR.UTF-8
LC_MEASUREMENT=es_AR.UTF-8
LC_MONETARY=es_AR.UTF-8
LC_NAME=es_AR.UTF-8
LC_NUMERIC=es_AR.UTF-8
LC_PAPER=es_AR.UTF-8
LC_TELEPHONE=es_AR.UTF-8
LC_TIME=es_AR.UTF-8
LOGNAME=<user>
PAPERSIZE=a4
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
PWD=<home>
QT4_IM_MODULE=xim
QT_ACCESSIBILITY=1
QT_IM_MODULE=ibus
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/1541,unix/<hostname>:/tmp/.ICE-unix/1541
SHELL=/bin/bash
SHLVL=0
SSH_AGENT_PID=1636
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
TZ=:/etc/localtime
USER=<user>
USERNAME=<user>
WINDOWPATH=2
XAUTHORITY=/run/user/1000/gdm/Xauthority
XDG_CONFIG_DIRS=/etc/xdg/xdg-pop:/etc/xdg
XDG_CURRENT_DESKTOP=pop:GNOME
XDG_DATA_DIRS=/usr/share/pop:/usr/local/share/:/usr/share/
XDG_MENU_PREFIX=gnome-
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=pop
XDG_SESSION_ID=2
XDG_SESSION_TYPE=x11
XDG_VTNR=2
XMODIFIERS=@im=ibus