[Patch] Replace uses of hasEditLayer() with new layer manager.

[michael2402]

Replace uses of old Main.hasEditLayer with layer manager.

The layer manager does not provide a hasEditLayer method. You can use an != null check here. In most cases where this was used you want to work with the edit layer directly afterwards, so you can simply get it and check if it is not null.

[Don-vip]

Still 4 warnings:

    [javac] C:\SVN\josm\core\src\org\openstreetmap\josm\gui\dialogs\RelationListDialog.java:341: warning: [deprecation] hasEditLayer() in Main has been deprecated
    [javac]             if (!Main.main.hasEditLayer()) return;
    [javac]                           ^
    [javac] C:\SVN\josm\core\src\org\openstreetmap\josm\gui\tagging\presets\TaggingPresetSearchAction.java:32: warning: [deprecation] hasEditLayer() in Main has been deprecated
    [javac]         if (!Main.main.hasEditLayer())
    [javac]                       ^
    [javac] C:\SVN\josm\core\src\org\openstreetmap\josm\gui\tagging\presets\TaggingPresetSearchPrimitiveDialog.java:47: warning: [deprecation] hasEditLayer() in Main has been deprecated
    [javac]             if (Main.main.hasEditLayer()) {
    [javac]                          ^
    [javac] C:\SVN\josm\core\src\org\openstreetmap\josm\gui\dialogs\CommandStackDialog.java:271: warning: [deprecation] hasEditLayer() in Main has been deprecated
    [javac]         if (!Main.main.hasEditLayer())
    [javac]                       ^

[Don-vip]

In 10453/josm:

fix #13023 - Replace uses of hasEditLayer() with new layer manager (patch by michael2402, modified) - gsoc-core

[michael2402]

I know. Those were the ones I want to investigate further if they are required or can be replaced by a better solution.