Remove --launcher.GTK_version 2 from Archi.ini on Linux

[Phillipus]

With reference to #391

Background

On Linux, Archi.ini contains the following entry:

--launcher.GTK_version
2

This is to force Archi to use GTK version 2 instead of the default version 3. This ensures that some UI features work (Undo/Redo animation, cell heights, for example).

This means that for the internal SWT Browser component to work some Linux distros (Ubuntu 18.04) may have to install libwebkitgtk-1.0.0:

sudo apt-get install libwebkitgtk-1.0.0

Problems

However, some distros no longer support libwebkitgtk-1.0.0 (Fedora 28, see #391).

Solution

If the entry is removed from Archi.ini then GTK version 3 is used and the SWT Browser component works without further user intervention (I tested this on Ubuntu 18.04 and Fedora 28).

Drawbacks

If Archi is running on Linux using GTK 3 then I have noticed these issues:

• When renaming a model, concept, folder or view in the models tree the text cell editor height is too short. Possible solution is to increase height only on Linux.
• The Undo/Redo animation no longer works causing a delay when performing Undo/Redo To see this - drag a box in a diagram view to a new position then select "Undo". Normally the box will slide back to it's first position. Using GTK 3 this does not happen, instead there is a delay which can make Archi seem sluggish. (This was also the case on Mac OS X, and the undo/redo animation feature was removed from Mac version.)

Fixes for Archi 4.3

• Remove the --launcher.GTK_version entry from Archi.ini
• Disable the Undo/Redo animations on Linux

[Phillipus]

Also, another issue is that GTK 2 is discontinued. Eclipse itself should run in GTK3.

[Phillipus]

See also http://javaclipse.blogspot.com/2015/06/mars-on-linux.html