[Bug] d.vect.chart GUI does not select multiple columns

[cmbarton]

Describe the bug

The GUI for d.vect.chart will not insert multiple column names for the columns argument.

It does insert multiple values for the colors argument.

It would nice if it could also insert multiple column names in the size_column argument because sometimes the chart size is a function of the sum or product of multiple columns.

To reproduce

1. Click on the text entry box for the columns argument
2. You are promoted to select a column from a pull down list
3. Click the text entry box again, and you are again prompted to select a column from the pull down list
4. The new column replaces the initially selected column instead of adding a second column preceded by a comma.

Expected behavior

Columns should be added to a comma separated list

System description

• Operating System: Mac OS 15.5
• GRASS GIS version: 8.5 (and earllier)

[petrasovaa]

This works for me, maybe it's a mac thing?

[nilason]

Could be Mac specific, at least I could reproduce it with:

version=8.4.1
date=2025
revision=45ca3179ab
build_date=2025-06-24
build_platform=aarch64-apple-darwin23.6.0
build_off_t_size=8
libgis_revision=45ca3179ab
libgis_date=2025-02-24T10:57:24+00:00
proj=9.6.2
gdal=3.11.0
geos=3.12.2
sqlite=3.50.1

Python 3.13.5 (main, Jun 12 2025, 21:50:42) [Clang 15.0.0 (clang-1500.3.9.4)]
wxPython 4.2.2 osx-cocoa (phoenix) wxWidgets 3.2.6

[cmbarton]

But the same process works fine in other modules, like r.color. So it is something about how the widget is defined or called.