Allow setting mode by widthxheight@refreshrate

This makes the mode setting through kscreen-doctor a bit more intuitive
and documents it

src/doctor/doctor.cpp

@@ -404,16 +404,19 @@ bool Doctor::setMode(int id, const QString &mode_id)
         if (output->id() == id) {
             // find mode
             Q_FOREACH (const KScreen::ModePtr mode, output->modes()) {
-               if (mode->id() == mode_id) {
-                    qCDebug(KSCREEN_DOCTOR) << "Taddaaa! Found mode" << mode->id() << mode->name();
+                auto name = QString("%1x%2@%3").arg(QString::number(mode->size().width()),
+                                    QString::number(mode->size().height()),
+                                    QString::number(qRound(mode->refreshRate())));
+                if (mode->id() == mode_id || name == mode_id) {
+                    qCDebug(KSCREEN_DOCTOR) << "Taddaaa! Found mode" << mode->id() << name;
                     output->setCurrentModeId(mode->id());
                     m_changed = true;
                     return true;
-               }
+                }
             }
         }
     }
-    cout << "Output mode " << id << " not found." << endl;
+    cout << "Output mode " << mode_id << " not found." << endl;
     return false;
 }
 

src/doctor/main.cpp

@@ -55,7 +55,9 @@ int main(int argc, char **argv)
     "\n   Disable the hdmi output, enable the laptop panel and set it to a specific mode\n"
     "   $ kscreen-doctor output.HDMI-2.disable output.eDP-1.mode.1 output.eDP-1.enable\n"
     "\n   Position the hdmi monitor on the right of the laptop panel\n"
-    "   $ kscreen-doctor output.HDMI-2.position.0,1280 output.eDP-1.position.0,0\n";
+    "   $ kscreen-doctor output.HDMI-2.position.0,1280 output.eDP-1.position.0,0\n"
+    "\n   Set resolution mode\n"
+    "   $ kscreen-doctor output.HDMI-2.mode.1920x1080@60 \n";
 /*
     "\nError codes:\n"
     "   2 : general parse error\n"