Resize popup on reference/subject set selection?

[bagage]

What steps will reproduce the problem?

1. Click on "Configure" button from conflation
2. Set the current selection as Reference (or Subject)

What is the expected result?

Layer name is displayed and near it the number of nodes/ways/relations in the selection.

What happens instead?

Layer name is displayed but we cannot see the number of X/X/X because the popup is too small due to the layer's name. If you close the popup and reopen it, this time it has the proper size.

Please provide any additional information below. Attach a screenshot if possible.

It would be good if either:

1) the popup was dynamically resizing on layer's name change.
2) the popup was larger at start, so that a layer standard name (10 letters? 20? 30?) could fit in it directly. It's already the case since there is "<Please select data>", but for instance a standard name for French cadastre tasks is "CL297-ST-BONNET-DE-VALCLERIEUX-houses-prediction_segmente.osm" so a lot longer (62 cars vs 21 chars).

Build-Date:2017-03-30 17:49:38
Revision:11772
Is-Local-Build:true

Identification: JOSM/1.5 (11772 SVN fr) Linux Debian GNU/Linux 9.0 (stretch)
Memory Usage: 702 MB / 1760 MB (228 MB allocated, but free)
Java version: 1.8.0_121-8u121-b13-4-b13, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u121-b13-4
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-13
Program arguments: [${HOME}/majcadastre/CL297-ST-BONNET-DE-VALCLERIEUX/CL297-ST-BONNET-DE-VALCLERIEUX-houses-prediction_segmente.osm]
Dataset consistency test: No problems found

Plugins:
+ PicLayer (33148)
+ buildings_tools (33004)
+ conflation (0.5.2)
+ jts (32699)
+ rex (26)
+ todo (30000)
+ utilsplugin2 (33182)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$SelectAction@4c38a061
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$AddAction@11c21e26
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$PassAction@7b7a5d35
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$MarkAction@5d5d1033

[bagage]

screenshot of the issue

[Tyndare]

​https://github.com/JOSM/conflation/commit/0ad25d87b33e0bd69939bd86379f5bd1407bf69a