Don't add hide_ui when not present

src/matrix/kstate.js

@@ -87,6 +87,12 @@ function diffKState(actual, target) {
 				diff[key] = temp
 			}
 
+		} else if (key === "chat.schildi.hide_ui/read_receipts") {
+			// Special handling: don't add this key if it's new. Do overwrite if already present.
+			if (key in actual) {
+				diff[key] = target[key]
+			}
+
 		} else if (key in actual) {
 			// diff
 			if (!isDeepStrictEqual(actual[key], target[key])) {

src/matrix/kstate.test.js

@@ -234,3 +234,31 @@ test("diffKState: kstate keys must contain a slash separator", t => {
 	, /does not contain a slash separator/)
 	t.pass()
 })
+
+test("diffKState: don't add hide_ui when not present", t => {
+	test("diffKState: detects new properties", t => {
+		t.deepEqual(
+			diffKState({
+			}, {
+				"chat.schildi.hide_ui/read_receipts/": {}
+			}),
+			{
+			}
+		)
+	})
+})
+
+test("diffKState: overwriten hide_ui when present", t => {
+	test("diffKState: detects new properties", t => {
+		t.deepEqual(
+			diffKState({
+				"chat.schildi.hide_ui/read_receipts/": {hidden: true}
+			}, {
+				"chat.schildi.hide_ui/read_receipts/": {}
+			}),
+			{
+				"chat.schildi.hide_ui/read_receipts/": {}
+			}
+		)
+	})
+})