Allow reuse of last opened editor via Project Explorer #3458
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Adds `OpenFileWithReuseActionProvider` that wraps the current OPEN handler (dependsOn org.eclipse.jdt.ui.navigator.actions.OpenActions) and installs a wrapper OPEN action in Project Explorer. For single IFile selections (pref enabled), reuse the last editor via `OpenFileWithReuseAction`. For all other selections (e.g., IJavaElement), delegate to the previously installed OPEN handler (JDT's OpenAction), preserving Java behavior.
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This PR implements the ability to optionally reuse the last opened editor (if non-dirty) when opening files from the Project Explorer. This has a similar UX to opening files from the search result view and when single click mode is enabled how vscode opens files.
This PR addresses #1692
When the JDT Plugin is installed in Eclipse it "hijacks" the OpenActions provider and file opening goes through
org.eclipse.jdt.internal.ui.navigator.PackageExplorerOpenActionProviderinstead oforg.eclipse.ui.internal.navigator.resources.actions.OpenActionProviderwhich does not apply the new logic. Therefore I added/configured an OpenFileWithReuseActionProvider that depends on the provider of the JDT (i.e. only activates when JDT is present) and wraps it so that opening of IFile is handled as expected.