Think about better support for pretty-diffs

[LinqLover]

I just stumbled into a situation where traditional diffs are easier to read than pretty diffs:

From:

installPreviewDependenciesForTests

	^ self installPreviewDependencies: {
		self depInbox: 'SUnit-ct.125'. "TestCase>>#runCaseWithoutTimeout for SandboxKernelTest"
		self depInbox: 'SUnit-ct.132'. "TestCase>>#assert:equals:description: with lazy descriptions"
		self depInbox: 'Kernel-ct.1407'. "Fixes Context >> #isPrimFailToken: for ProtoObjects"
	}

To:

installPreviewDependenciesForTests

	^ self installPreviewDependencies: {
		self depInbox: 'SUnit-ct.125'. "TestCase>>#runCaseWithoutTimeout for SandboxKernelTest"
		self depInbox: 'SUnit-ct.132'. "TestCase>>#assert:equals:description: with lazy descriptions"
	}

Traditional diff:

 installPreviewDependenciesForTests
 
 	^ self installPreviewDependencies: {
 		self depInbox: 'SUnit-ct.125'. "TestCase>>#runCaseWithoutTimeout for SandboxKernelTest"
 		self depInbox: 'SUnit-ct.132'. "TestCase>>#assert:equals:description: with lazy descriptions"
-		self depInbox: 'Kernel-ct.1407'. "Fixes Context >> #isPrimFailToken: for ProtoObjects"
 	}

Poppy-printed diff:

 installPreviewDependenciesForTests
 
-	^ self installPreviewDependencies: {self depInbox: 'SUnit-ct.125'. self depInbox: 'SUnit-ct.132'. self depInbox: 'Kernel-ct.1407'}
+	^ self installPreviewDependencies: {self depInbox: 'SUnit-ct.125'. self depInbox: 'SUnit-ct.132'}
 	"TestCase>>#runCaseWithoutTimeout for SandboxKernelTest"
-	"TestCase>>#assert:equals:description: with lazy descriptions"
-	"Fixes Context >> #isPrimFailToken: for ProtoObjects"
+	"TestCase>>#assert:equals:description: with lazy descriptions"

Of course, this is a combination of multiple issues (#8 - my personal most wanted issue :-)), but it also shows that hard-coded line-break intervals might be an imperfect strategy when creating diffs. Probably PoppyPrint should support a separate diff mode where two source codes are compared based on their ASTs first and a diff is generated afterward? Or would this be out of scope for PoppyPrint?