[libraries/ksanecore] src: Extend pixma polling naughty list to include USB backends

Git commit 6be7437e64e78dadbe62727647f27c4772bd5b96 by Roman Vasilev, on behalf of Roman Vasilev.
Committed on 27/07/2026 at 09:50.
Pushed by sars into branch 'master'.

Extend pixma polling naughty list to include USB backends

The performance naughty list already blocked option polling for pixma
network backends (matching IP-like device names), but USB pixma
scanners like the CanoScan LiDE 300 suffer from exactly the same issue:
each poll of a SOFT_DETECT option blocks for ~1 second, turning the UI
into a slideshow.

Changed the regex from matching only IP-address patterns to matching
any pixma backend ("^pixma"), which covers both network and USB
devices. The pixma backend family shares a single codebase and the
1-second-per-poll behavior is consistent across all connection types.

Tested with CanoScan LiDE 300 (pixma:04A91913_5463B1) — skanlite UI
is noticeably snappier with polling disabled.

M  +7    -6    src/interface_p.cpp

https://invent.kde.org/libraries/ksanecore/-/commit/6be7437e64e78dadbe62727647f27c4772bd5b96

diff --git a/src/interface_p.cpp b/src/interface_p.cpp
index 9beadc1..a7adc84 100644
--- a/src/interface_p.cpp
+++ b/src/interface_p.cpp
@@ -220,13 +220,14 @@ Interface::OpenStatus InterfacePrivate::loadDeviceOptions()
     m_externalOptionsList.append(new InternalOption(invertOption));
     m_optionsLocation.insert(Interface::InvertColorOption, m_optionsList.size() - 1);
 
-    // NOTICE The Pixma network backend behaves badly. polling a value will result in 1 second
-    // sleeps for every poll. The problem has been reported, but no easy/quick fix was available and
-    // the bug has been there for multiple years. Since this destroys the usability of the backend totally,
-    // we simply put the backend on the naughty list and disable the option polling.
-    static QRegularExpression pixmaNetworkBackend(QStringLiteral("pixma.*\\d+\\.\\d+\\.\\d+\\.\\d+"));
+    // NOTICE The Pixma backend (USB and network) behaves badly. polling a value will
+    // result in 1 second sleeps for every poll. The problem has been reported, but no
+    // easy/quick fix was available and the bug has been there for multiple years. Since
+    // this destroys the usability of the backend totally, we simply put the backend on
+    // the naughty list and disable the option polling.
+    static QRegularExpression pixmaBackend(QStringLiteral("^pixma"));
     m_optionPollingNaughtylisted = false;
-    if (pixmaNetworkBackend.match(m_devName).hasMatch()) {
+    if (pixmaBackend.match(m_devName).hasMatch()) {
         m_optionPollingNaughtylisted = true;
     }