Not all buttons are shown in exit confirmation dialog

[holgermappt]

What steps will reproduce the problem?

1. Optional: Choose a language with long translations, e.g. German
2. Create a data layer with unsaved changed
3. Quit JOSM (Ctrl+q)
4. Reduce the width of the Unsaved changes dialog window

What is the expected result?

All options are shown: Perform actions before exiting, Exit now, Cancel. Or an indication that there are more options, e.g. a scroll bar.

What happens instead?

Depending on the window size, one or two buttons are not displayed. There is no active button if no action is active and the window is small.

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

Build-Date: 2015-02-22 17:57:05
Revision: 8098
Is-Local-Build: true

Identification: JOSM/1.5 (8098 SVN de) Linux openSUSE 13.2 (Harlequin) (x86_64)
Memory Usage: 481 MB / 7141 MB (342 MB allocated, but free)
Java version: 1.7.0_75, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: java-1_7_0-openjdk:x86_64-1.7.0.75
Dataset consistency test: No problems found

[holgermappt]

German with default window size, Cancel is missing.

[holgermappt]

German with wider window, now all buttons are shown.

[holgermappt]

English with reduced width, the only button is grayed out.

[holgermappt]

There are more dialogs that have the same issue, e.g. the Open changesets window (File, Close open changesets).

[skyper]

See also #7826. I have this problem also with several dialogs.