Expand combobox in preferences

[anonymous]

What steps will reproduce the problem?

1. Open preferences
2. Change velocity
3. Not all text can be seen in the combobox.

What is the expected result?

All text can be seen in the combobox.

What happens instead?

Not all text can be seen in the combobox.

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

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-01-14 21:10:48 +0100 (Sat, 14 Jan 2017)
Build-Date:2017-01-15 02:35:18
Revision:11463
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11463 da) Windows XP 32-Bit
Memory Usage: 157 MB / 247 MB (51 MB allocated, but free)
Java version: 1.8.0_111-b14, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1152x864
Maximum Screen Size: 1152x864
VM arguments: [-Duser.home=%UserProfile%]

Plugins:
+ BuildingGeneralization (1010)
+ DxfImport (1008)
+ Mapillary (v1.3.2)
+ PicLayer (33088)
+ ShapeTools (1220)
+ apache-commons (32994)
+ apache-http (32699)
+ areaselector (1478814827)
+ continuosDownload (53)
+ junctionchecking (33088)
+ log4j (32699)
+ pdfimport (33004)
+ pt_assistant (33108)
+ reverter (33088)
+ tageditor (33021)
+ todo (30000)
+ turnlanes-tagging (254)
+ turnrestrictions (33088)
+ utilsplugin2 (33088)
+ wikipedia (33098)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1

Last errors/warnings:
- W: Unable to get color from '' for color preference 'extrude.main.line'
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'

[anonymous]

Also expand combobox for heat map.

[kidelo]

I think we should adjust the width of the combobox in a manner like the detection of the maximum height, see:

25	/**
26	 * Class overriding each {@link JComboBox} in JOSM to control consistently the number of displayed items at once.<br/>
27	 * This is needed because of the default Java behaviour that may display the top-down list off the screen (see #7917).
28	 *
29	 * @since 5429
30	 */
31	public class JosmComboBox extends JComboBox {

...

117	     * Finds the prototype display value to use among the given possible candidates.
118	     * @param possibleValues The possible candidates that will be iterated.
119	     * @return The value that needs the largest display height on screen.
120	     * @since 5558
121	     */
122	    protected Object findPrototypeDisplayValue(Collection<?> possibleValues)

Then we have a common solution for all the languages.

[bastiK]

In 11474/josm:

fixed #14244 - Expand combobox in preferences; add translation context