Desktop: Improved: Add number of characters removed and added in revision list

CliClient/tests/models_Revision.js

@@ -68,4 +68,37 @@ describe('models_Revision', function() {
 		expect(newRevs[2].id).toBe('789');
 	}));
 
+	it('should create patch stats', asyncTest(async () => {
+		const tests = [
+			{
+				patch: `@@ -625,16 +625,48 @@
+ rrupted download
++%0A- %5B %5D Fix mobile screen options`,
+				expected: [-0, +32],
+			},
+			{
+				patch: `@@ -564,17 +564,17 @@
+ ages%0A- %5B
+- 
++x
+ %5D Check `,
+ 				expected: [-1, +1],
+ 			},
+ 			{
+ 				patch: `@@ -1022,56 +1022,415 @@
+ .%0A%0A#
+- How to view a note history%0A%0AWhile all the apps 
++%C2%A0How does it work?%0A%0AAll the apps save a version of the modified notes every 10 minutes.
+ %0A%0A# `,
+ 				expected: [-(19+27+2), 17+67+4],
+ 			},
+		];
+
+		for (const test of tests) {
+			const stats = Revision.patchStats(test.patch);
+			expect(stats.removed).toBe(-test.expected[0]);
+			expect(stats.added).toBe(test.expected[1]);
+		}
+	}));
+
 });