Fix placement of placeholder text in QLineEdits with action icons

After dc794f7622bc00f7ca50fab65d6965695d6d2972, side widgets only got
space if they were not fading out, but the logic was not correctly
accounting for side widgets that never fade, such as buttons added via
QLineEdit::addAction.

Fix this to give visible widgets space, unless they are fading out. That
was the intent of the original change. Rename the variable to make its
purpose clearer, and reset it at the end of the fade-out animation.

Add a much-needed test that relies on private APIs to verify that the
effective margins are calculated correctly.

Fixes: QTBUG-94824
Change-Id: If2ee6be52be9e4f9be1e91f72f27681ce27def6d
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
(cherry picked from commit 0e6b31019f01c72ea3af3de31095f8269c7d7f30)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 9 insertions, 5 deletions

diff --git a/src/widgets/widgets/qlineedit_p.cpp b/src/widgets/widgets/qlineedit_p.cpp
index 89fc66d123..e5499dbb3f 100644
--- a/src/widgets/widgets/qlineedit_p.cpp
+++ b/src/widgets/widgets/qlineedit_p.cpp
@@ -406,8 +406,9 @@ void QLineEditIconButton::setHideWithText(bool hide)
 
 void QLineEditIconButton::onAnimationFinished()
 {
-    if (shouldHideWithText() && isVisible() && !m_wasHidden) {
+    if (shouldHideWithText() && isVisible() && m_fadingOut) {
         hide();
+        m_fadingOut = false;
 
         // Invalidate previous geometry to take into account new size of side widgets
         if (auto le = lineEditPrivate())
@@ -417,7 +418,7 @@ void QLineEditIconButton::onAnimationFinished()
 
 void QLineEditIconButton::animateShow(bool visible)
 {
-    m_wasHidden = visible;
+    m_fadingOut = !visible;
 
     if (shouldHideWithText() && !isVisible()) {
         show();
diff --git a/src/widgets/widgets/qlineedit_p.h b/src/widgets/widgets/qlineedit_p.h
index c03265e3f9..1ffb46cdb4 100644
--- a/src/widgets/widgets/qlineedit_p.h
+++ b/src/widgets/widgets/qlineedit_p.h
@@ -95,8 +95,11 @@ public:
 
     bool shouldHideWithText() const;
     void setHideWithText(bool hide);
-    // m_wasHidden is true unless the button is fading out
-    bool needsSpace() const { return m_wasHidden; }
+    bool needsSpace() const {
+        if (m_fadingOut)
+            return false;
+        return isVisibleTo(parentWidget());
+    }
 #endif
 
 protected:
@@ -120,7 +123,7 @@ private:
 
 #if QT_CONFIG(animation)
     bool m_hideWithText = false;
-    bool m_wasHidden = false;
+    bool m_fadingOut = false;
 #endif
 
 };