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I was evaluating the Enterprise IDE plugin for Eclipse, and ultimately decided not to purchase it. After I uninstalled the plugin, I was left with a bunch of perspective buttons (the ones in the far upper-right-hand corner) which I can't remove. How do I get rid of the manually, without nuking my workspace?
Edit: To be clear, right-clicking and going to "close" does nothing. Not even an error message.
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To remove a plug-in you need to remove the JAR file from the "plugins" directory, located in your Eclipse installation directory. Under Indigo/3.7 the "Help > About Eclipse > Installation Details > Installed Software tab > Uninstall..." option works.
To uninstall you should either go on and remove the org. python. pydev* from eclipse/plugins and eclipse/features or you can go to help > software updates > manage configuration, choose the PyDev plugin and disable it (after that, to completely remove it, you must restart Eclipse and only then select it for uninstall).
Open the SonarLint Issues view. Select all. (Ctrl-A is your friend). Right click and choose Delete.
Click Window ► Preferences ► General ► Perspectives. Select the perspective you want to delete and remove it. Some of them are unremovable. I don't know why.
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How did you uninstall that plugin ?
As Daniel details in his answer, Help-> Install new software -> click on "Whats already installed?" is the right way to uninstall a plugin, and should get rid of the perspective as well.
If the plugin was installed in the dropins directory or in <eclipse>/plugins and <eclipse>/features, did you delete all directories/jar in <eclipse>/features, because if that plugin was packaged as a product, it did define in the product extension point a plugin_customization.ini which can indicate some perspective buttons.
If not, the only solution is to have a careful look at your workspace metadata, look for all recent file related to that plugin and remove them.
Make a copy of your workspace first though.
As an example of such a careful look at your workspace metadata", user900975 points out in his answer the <your workspace folder>/.metadata/.plugins/org.eclipse.ui.workbench/workbench.xml file, with <perspectives> element and <perspective> child elements that you can remove.
Note: Eightball mentions in his answer (upvoted) the possibility to list and delete a perspective.
Since he mentions "Some of them are un-removable. I don,t know why", my original answer above still stands.
Alexandros adds in the comments:
This helped me fix this, but in my case the file I had to edit while Eclipse was closed was:
.metadata\.plugins\org.eclipse.e4.workbench\workbench.xmi
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