Bug 3555 source for binaries - 'defaults' button does not work (1G840M4)
AK (1/25/01 2:43:33 PM) 1. create a java project 2. open the properties page for rt.jar in the project 3. clear the 'Sources JAR file' field 4. press 'Defaults' nothing happens NOTES: EG (2/1/01 10:02:53 AM) wait until we finish the Library presentation issue.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceAttachmentBlock.java
fFileNameField.enableButton(canBrowseFileName());
		
		
		if (fFullPathResolvedLabel != null) {
			fFullPathResolvedLabel.setText(getResolvedLabelString(fFileNameField.getText(), true));
		}
		if (fPrefixResolvedLabel != null) {
			fPrefixResolvedLabel.setText(getResolvedLabelString(fPrefixField.getText(), false));
		}
		
		IStatus status= StatusUtil.getMostSevere(new IStatus[] { fNameStatus, fPrefixStatus, fJavaDocStatus });
		fContext.statusChanged(status);
	}
	
	private boolean canBrowseFileName() {
		if (!fIsVariableEntry) {
			return true;
		}
		
		if (fFileVariablePath != null) {
			return fFileVariablePath.toFile().isDirectory();
		}
		return false;
	}
	
	private boolean canBrowsePrefix() {
		
		
		if (fResolvedFile != null) {
			if (fIsVariableEntry) {