undelete plugin hangs with a lot of objects in "Object ID" field

[naoliv]

Insert a lot of objects to undelete (like the 7396 nodes from ​http://naoliv.iq.unesp.br/osm/10779-nodes.txt) and run undelete without any problems.
Then run "undelete object" again and in the "Object ID" text box press "Home". Now see how JOSM uses 100% of the CPU (and you can't move the cursor in the box, nor delete anything and then insert new object IDs).

JOSM:

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-11-24 02:33:57
Last Changed Author: Don-vip
Revision: 7743
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-11-23 23:54:40 +0100 (Sun, 23 Nov 2014)
Last Changed Rev: 7743

Identification: JOSM/1.5 (7743 pt_BR) Linux Debian GNU/Linux testing (jessie)
Memory Usage: 247 MB / 8158 MB (94 MB allocated, but free)
Java version: 1.7.0_65, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u71-2.5.3-2
VM arguments: [-Dawt.useSystemAAFontSettings=on]

Plugins:
- Create_grid_of_ways (30762)
- ImageryCache (30738)
- OpeningHoursEditor (30737)
- PicLayer (30762)
- SimplifyArea (30791)
- buildings_tools (30762)
- conflation (0.1.7)
- contourmerge (1012)
- download_along (30762)
- editgpx (30737)
- geotools (30762)
- importvec (30762)
- jts (30762)
- log4j (30762)
- measurement (30737)
- merge-overlap (30784)
- notes (v0.9.5)
- opendata (30806)
- pbf (30762)
- pdfimport (30737)
- poly (30738)
- reverter (30737)
- scripting (30702)
- todo (29154)
- turnrestrictions (30762)
- undelete (30762)
- utilsplugin2 (30762)

Last errors/warnings:
- E: Falha ao localizar imagem 'maxspeed_icon.svg'
- W: Mappaint style "standard" (Maxspeed) icon "maxspeed_icon.svg" not found.

[GerdP]

I can reproduce this problem (On Windows I have to use Pos1 instead of Home key). It takes very long (~15 secs) but finally JOSM reacts again. I'll try to find out more...

[GerdP]

Maybe a Java problem? It hangs for very long (time seems to depend on original cursor position) in Dialog.setVisible():

I guess the problem is that the content of the input field is much larger than normal (a string with more than 87700 characters).
The problem appears in all dialogs with a JosmTextField
For example, it also occurs when you enter such a long string as tag value and press Pos1 or press Ctrl+A.

[GerdP]

Java flight recorder for JOSM session

[GerdP]

I've tried to nail down what happens with java flight recorder:

SET javaopt=-Xmx2G 
set jmcparm=-XX:+UnlockCommercialFeatures -XX:+FlightRecorder -XX:StartFlightRecording=name=MyRecording2,settings=d:\dbg\gerd.jfc -XX:FlightRecorderOptions=defaultrecording=true,dumponexit=true,dumponexitpath=e:\ld\perf_%dt%_%t%.jfr
start "josm-custom" java.exe %jmcparm% %javaopt% -jar c:\josm\core\dist\josm-custom.jar %1 %2 %3 %4 %5 %6 %7 %8 %9

I execute JOSM with these settings and use the very long list as described above. This is what JMC shows for the period after pressing the Pos1 key: Method sun.font.FontDesignMetrics.handleCharWidth(int)uses more than 98% of CPU time.
Hope this helps. I have no idea what to do about it.