Type into any window: fake input when no text field is focused

- KWinFakeInput (org_kde_kwin_fake_input v6, offered by KWin to the
  input-method process): keysyms with real modifier keys held
- The KWin backend uses the input method in text fields and fake input
  everywhere else, so shortcuts, terminals and the desktop get keys
- Text rules (auto-capitalization, double-space) only apply in fields
- Always Show setting keeps the keyboard up without a text field

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/tst_controller.cpp

@@ -10,6 +10,10 @@ using namespace Qt::StringLiterals;
 
 namespace {
 
+const TextContext Field{.field = true};
+// A field with some text already: no auto-shift until a test asks for it.
+const TextContext MidSentence{.field = true, .hasSurroundingText = true, .textBeforeCursor = u"so"_s};
+
 KeyDef makeKey(KeyType type, const QString &label = {})
 {
     KeyDef k;
@@ -44,6 +48,7 @@ private Q_SLOTS:
         model.setLayout(TestLayouts::build("us"));
         model.setVisibleSections({MainSectionId});
         controller = std::make_unique<KeyboardController>(engine, model);
+        controller->resetContext(MidSentence); // most tests type into a text field
     }
 
     void typesLowercase()
@@ -103,7 +108,7 @@ private Q_SLOTS:
 
     void capitalizesAtSentenceStart()
     {
-        controller->resetContext();
+        controller->resetContext(Field);
         QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Once);
         for (const char *c : {"h", "i", ".", " "})
             tap(makeKey(KeyType::Character, QString::fromLatin1(c)));
@@ -114,7 +119,7 @@ private Q_SLOTS:
 
     void noCapitalizationInPasswordFields()
     {
-        TextContext context;
+        TextContext context = Field;
         context.purpose = TextContext::Purpose::Password;
         controller->setContext(context);
         QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Off);
@@ -122,7 +127,7 @@ private Q_SLOTS:
 
     void fieldTextDrivesCapitalization()
     {
-        TextContext context;
+        TextContext context = Field;
         context.hasSurroundingText = true;
         context.textBeforeCursor = u"Done! "_s;
         controller->setContext(context);
@@ -152,12 +157,12 @@ private Q_SLOTS:
         tap(makeKey(KeyType::Character, u"a"_s));
         tap(space);
         tap(space);
-        QCOMPARE(engine.output, u"A  ");
+        QCOMPARE(engine.output, u"a  ");
     }
 
     void autoCapitalizationCanBeTurnedOff()
     {
-        controller->resetContext();
+        controller->resetContext(Field);
         controller->setOptions({.autoCapitalize = false});
         QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Off);
         tap(makeKey(KeyType::Character, u"a"_s));
@@ -166,7 +171,7 @@ private Q_SLOTS:
 
     void doubleTapShiftLocksAtSentenceStart()
     {
-        controller->resetContext(); // a field was focused
+        controller->resetContext(Field); // a field was focused
         QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Once); // auto-shift
         const KeyDef shift = makeKey(KeyType::Shift);
         controller->keyDown(shift, 5000);
@@ -281,7 +286,7 @@ private Q_SLOTS:
 
     void autoShiftAndCapsLockDontApplyToFunctionKeys()
     {
-        controller->resetContext(); // sentence start: auto-shift on
+        controller->resetContext(Field); // sentence start: auto-shift on
         QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Once);
         tap(keysymKey(XKB_KEY_Left));
         QCOMPARE(engine.lastModifiers, Qt::NoModifier);
@@ -303,10 +308,10 @@ private Q_SLOTS:
         lj.shifted = u"2"_s;
         KeyDef one = makeKey(KeyType::Character, u"+"_s);
         one.shifted = u"1"_s;
-        controller->resetContext(); // sentence start
+        controller->resetContext(Field); // sentence start
         tap(one);
         QCOMPARE(engine.output, u"+"); // not the shifted level
-        controller->resetContext();
+        controller->resetContext(Field);
         tap(lj);
         QCOMPARE(engine.output, u"+Ľ");
         tap(makeKey(KeyType::Shift)); // the user's shift does pick it
@@ -325,6 +330,17 @@ private Q_SLOTS:
         QVERIFY(engine.output.endsWith(u"é"_s));
     }
 
+    void noTextRulesWithoutAField()
+    {
+        controller->resetContext({}); // keys go to a window, not a text field
+        QCOMPARE(controller->shiftMode(), KeyboardController::ShiftMode::Off);
+        const KeyDef space = makeKey(KeyType::Space);
+        tap(makeKey(KeyType::Character, u"a"_s));
+        tap(space);
+        tap(space);
+        QCOMPARE(engine.output, u"a  ");
+    }
+
     void dismissEmitsSignal()
     {
         int dismissed = 0;

tests/tst_visibility.cpp

@@ -27,6 +27,18 @@ private Q_SLOTS:
         QVERIFY(v.isVisible());
     }
 
+    void alwaysVisibleShowsWithoutField()
+    {
+        VisibilityController v;
+        v.setAlwaysVisible(true);
+        QVERIFY(v.isVisible());
+        v.hide(); // dismiss key still works...
+        QVERIFY(!v.isVisible());
+        v.setFieldActive(true); // ...until the focus changes
+        v.setFieldActive(false);
+        QVERIFY(v.isVisible());
+    }
+
     void toggleShowsWithoutField()
     {
         VisibilityController v;