Fix parse_lpo_and_dwpp not raising ValueError under some circumstances (#5268)

Co-authored-by: JSap0914 <JSap0914@users.noreply.github.com>

changes/unreleased/5268.GKZnfBkMcLqBC4rTgznsnY.toml

@@ -0,0 +1,5 @@
+bugfixes = "Fixed ``parse_lpo_and_dwpp`` silently overwriting ``link_preview_options`` when ``disable_web_page_preview=False``."
+[[pull_requests]]
+uid = "5268"
+author_uids = ["JSap0914"]
+closes_threads = []

src/telegram/_utils/argumentparsing.py

@@ -86,7 +86,7 @@ def parse_lpo_and_dwpp(
     """Wrapper around warn_about_deprecated_arg_return_new_arg. Takes care of converting
     disable_web_page_preview to LinkPreviewOptions.
     """
-    if disable_web_page_preview and link_preview_options:
+    if disable_web_page_preview is not None and link_preview_options:
         raise ValueError(
             "Parameters `disable_web_page_preview` and `link_preview_options` are mutually "
             "exclusive."

tests/_inline/test_inputtextmessagecontent.py

@@ -97,6 +97,11 @@ class TestInputTextMessageContentWithoutRequest(InputTextMessageContentTestBase)
             InputTextMessageContent(
                 "text", disable_web_page_preview=True, link_preview_options=LinkPreviewOptions()
             )
+        # disable_web_page_preview=False is also an explicit value and must conflict
+        with pytest.raises(ValueError, match="`link_preview_options` are mutually exclusive"):
+            InputTextMessageContent(
+                "text", disable_web_page_preview=False, link_preview_options=LinkPreviewOptions()
+            )
 
     def test_disable_web_page_preview_deprecation(self):
         itmc = InputTextMessageContent("text", disable_web_page_preview=True)