Text fields act weirdly

[gaben]

What steps will reproduce the problem?

1. Open the tag editor
2. Write something in one of the fields
3. Select what you wrote (Ctrl+A), then copy (Ctrl+C)
4. Press Home to put the cursor to the beginning of the text field
5. Try pressing Ctrl+V

What is the expected result?

The paste should work in step 5.

What happens instead?

It doesn't :( I can't decide if it's a feature or a bug.
I also noticed, that after paste the selection remains on the pasted text.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2019-09-27 18:30:18 +0200 (Fri, 27 Sep 2019)
Build-Date:2019-09-28 01:30:52
Revision:15382
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15382 hu) Windows 10 64-Bit
OS Build number: Windows 10 Pro 1903 (18362)
Memory Usage: 699 MB / 1820 MB (482 MB allocated, but free)
Java version: 1.8.0_221-b11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1200
Maximum Screen Size: 1920x1200
VM arguments: [-Djava.security.manager, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm-latest.jnlp, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlp.tk=awt, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.splashport=55585, -Djnlpx.home=<java.home>\bin, -Djnlpx.remove=false, -Djnlpx.offline=false, -Djnlpx.relaunch=true, -Djnlpx.session.data=%UserProfile%\AppData\Local\Temp\session6419869405489899767, -Djnlpx.heapsize=-1,2147483648, -Djava.security.policy=file:<java.home>\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.origFilenameArg=%UserProfile%\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\31\583aa85f-25d43383]
Dataset consistency test: No problems found

Plugins:
+ FixAddresses (34977)
+ OpeningHoursEditor (34977)
+ apache-commons (35092)
+ buildings_tools (34982)
+ continuosDownload (82)
+ ejml (35122)
+ geojson (124)
+ geotools (35137)
+ jaxb (35014)
+ jts (35122)
+ junctionchecking (34977)
+ opendata (35139)
+ reverter (35084)
+ tag2link (35149)
+ tageditor (34977)
+ turnlanes-tagging (281)
+ utilsplugin2 (35098)
+ wikipedia (v1.1.1)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Healthcare&zip=1

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

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/OsmoseValidations&zip=1

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: java.io.IOException: A kért URL https://josm.openstreetmap.de/josmfile?page=Rules/OsmoseValidations&zip=1 nem található
- W: Nem sikerült https://josm.openstreetmap.de/josmfile?page=Rules/OsmoseValidations&zip=1 hozzáadása a címke ellenőrzőhöz
- W: java.io.IOException: No file found for: https://josm.openstreetmap.de/josmfile?page=Rules/OsmoseValidations&zip=1

[Don-vip]

Not sure, but I think we have an intended mechanism that detects if the string you are trying to paste is the exact same as the current one, to avoid strange duplicate copy-paste in case you press on ctrl-v too long.

[Don-vip]

Ah no, that's a side effect of AutoCompletingComboBox implementation, see #2729 / r3214:

I can't really change this without causing a lot of trouble in other use cases.

    @Override
    public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
        if (selecting || (offs == 0 && str.equals(getText(0, getLength()))))
            return;
        // ...
    }

[gaben]

Replying to Don-vip:

Not sure, but I think we have an intended mechanism that detects if the string you are trying to paste is the exact same as the current one, to avoid strange duplicate copy-paste in case you press on ctrl-v too long.

I had similar idea, that maybe it is intended behaviour.

Nevertheless, thanks for checking.