[Gambas-bugtracker] Bug #1519: No Picture Display with gb.qt5

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.1519&from=L21haW4-

Claus DIETRICH reported a new bug.

Summary
-------

No Picture Display with gb.qt5

Type             : Bug
Priority         : High
Gambas version   : 3.12
Product          : QT5 component


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

Hi
A Gambas application for scanners surprisingly didn't show scanned pictures in a picture box and a ListView under my newly arranged Mint 19.1 Mate and Mint 19 Xfce. 

Here are the results of my investigations: 
According to the latest information the used IDE-Version 3.12.2 now chooses gb.qt5 if it is available. Please also refer to the below system information which reconfirms the use of gb.qt5.
I wrote a simple demo program (attached hereto) with the gb.gui.qt qt4/5 change component for the reproduction of this bug with following result:
- jpg and png pictures are displayed in the picture box
- tif-pictures are not displayed in the picture box

With the experience of recent issues with Gambas and gb.qt5 I de-installed gb.qt5 with the result that jpg, png and tif pictures were now displayed successfully. 

My conclusion: 
There seems to be a bug in displaying the tif format under gb.qt5 and it is suggested to investigate all other components which inherit the bug (i.e. Listview).

With best regards
dididunst


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

[System]
Gambas=3.12.2
OperatingSystem=Linux
Kernel=4.15.0-44-generic
Architecture=x86_64
Distribution=Linux Mint 19.1 Tessa
Desktop=MATE
Theme=Qt5CTProxy
Language=de_DE.UTF-8
Memory=3945M

[Libraries]
Cairo=libcairo.so.2.11510.0
Curl=libcurl.so.4.5.0
DBus=libdbus-1.so.3.19.4
GStreamer=libgstreamer-1.0.so.0.1401.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2200.30
OpenGL=libGL.so.1.0.0
Poppler=libpoppler.so.73.0.0
QT4=libQtCore.so.4.8.7
QT5=libQt5Core.so.5.9.5
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
CLUTTER_BACKEND=x11
COMPIZ_CONFIG_PROFILE=mate
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DEFAULTS_PATH=/usr/share/gconf/mate.default.path
DESKTOP_SESSION=mate
DISPLAY=:0
GB_GUI=gb.qt5
GDMSESSION=mate
GDM_LANG=de_DE
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK_MODULES=gail:atk-bridge
GTK_OVERLAY_SCROLLING=0
HOME=<home>
LANG=de_DE.UTF-8
LANGUAGE=de_DE.UTF-8
LOGNAME=<user>
MANDATORY_PATH=/usr/share/gconf/mate.mandatory.path
MATE_DESKTOP_SESSION_ID=this-is-deprecated
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
PWD=<home>
QT_ACCESSIBILITY=1
QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_QPA_PLATFORMTHEME=qt5ct
QT_SCALE_FACTOR=1
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/1503,unix/<hostname>:/tmp/.ICE-unix/1503
SHELL=/bin/bash
SHLVL=0
SSH_AGENT_PID=1780
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
TZ=:/etc/localtime
USER=<user>
XAUTHORITY=<home>/.Xauthority
XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg
XDG_CURRENT_DESKTOP=MATE
XDG_DATA_DIRS=/usr/share/mate:<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_SESSION_DESKTOP=mate
XDG_SESSION_ID=c1
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
XDG_SESSION_TYPE=x11
XDG_VTNR=7