text block newline formatter settings

[inuyasha82]

What it does

Implement UI part of issue #2731

How to test

Just add some textblock like:

		String str3 = "asd" + """
				subd3
				ospl
				test""" + "osd\n";		

Make sure to enable the new formatter option: `After and before opening and closing a text block"

Author checklist

• I have thoroughly tested my changes
• The change is following the coding conventions
• I have signed the Eclipse Contributor Agreement (ECA)

[jjohnstn]

Some problems exist. When I format the following code with the new option set in the UI (via your other patch):

package tests

public class TestTextBlockFormatter {

	public static void foo() {
		final String x = """
				abc
				def
				ghi""";
		System.out.println("<" + x + ">");
	}

	public static void foo2() {
		final String str3 = "asd" + """
				subd3
				ospl
				test""" + "osd\n";
		System.out.println("<" + str3 + ">");
	}

	public static void main(String[] args) {
		TestTextBlockFormatter.foo();
		TestTextBlockFormatter.foo2();
	}
}

I sometimes get:

package tests;

public class TestTextBlockFormatter {

	public static void foo() {
		final String x =
		"""
				abc
				def
				ghi\
				"""
		;
		System.out.println("<" + x + ">");
	}

	public static void foo2() {
		final String str3 = "asd" +
				"""
						subd3
						ospl
						test\
				"""
				+ "osd\n";
		System.out.println("<" + str3 + ">");
	}

	public static void main(String[] args) {
		TestTextBlockFormatter.foo();
		TestTextBlockFormatter.foo2();
	}
}

This is wrong for foo2() and matches your test. The closing triple quote where it is means that all the text is indented by 2 tabs when you print it. The foo() case is correct and puts the tripe quote where it should go (matching the start of each text line).

The weird part is that sometimes I get the following without changing any preferences after undoing and re-running format:

package tests;

public class TestTextBlockFormatter {

	public static void foo() {
		final String x = """
				abc
				def
				ghi\
				""";
		System.out.println("<" + x + ">");
	}

	public static void foo2() {
		final String str3 = "asd" + """
				subd3
				ospl
						test\
				"""
				+ "osd\n";
		System.out.println("<" + str3 + ">");
	}

	public static void main(String[] args) {
		TestTextBlockFormatter.foo();
		TestTextBlockFormatter.foo2();
	}
}

As you can see, the foo2() is wrong on the 3rd text block line that got modified. The triple end-quote is correct but it didn't add the newline for the opening triple quotes.

[jjohnstn]

Looks good. Thanks.