fix(capslockindicator): fix altering the line edit height

Fix altering the Line Edit widget height when the indicator is on (e.g.
when caps lock is active).

To avoid messing with the style and all the complex issues that arise
from it, use an action to display the icon inside the line edit, as it
is a built-in feature that work just fine.

Fixes qTox#3379.

src/widget/capslockindicator.cpp

@@ -3,40 +3,12 @@
 #include "src/platform/capslock.h"
 #endif
 
-CapsLockIndicator::CapsLockIndicator(QWidget *parent) : QToolButton(parent)
+CapsLockIndicator::CapsLockIndicator(QLineEdit *parent) :
+    QAction(parent),
+    parent(parent)
 {
-    cleanInputStyle = parentWidget()->styleSheet();
-
-    QIcon icon = QIcon(":img/caps_lock.svg");
-    setIcon(icon);
-    setCursor(Qt::ArrowCursor);
-    setStyleSheet("border: none; padding: 0; color: white");
+    setIcon(QIcon(":img/caps_lock.svg"));
     setToolTip(tr("CAPS-LOCK ENABLED"));
-    updateSize();
-}
-
-void CapsLockIndicator::updateSize()
-{
-    inputSize = parentWidget()->size();
-    move(inputSize.width() - inputSize.height(), 0);
-
-    int side = inputSize.height() - 5;
-    QSize iconSize(side, side);
-    setIconSize(iconSize);
-}
-
-void CapsLockIndicator::show()
-{
-    QToolButton::show();
-
-    QString style = QString("padding: -3px %1px -3px -6px; color: white").arg(iconSize().width() - 3);
-    parentWidget()->setStyleSheet(style);
-}
-
-void CapsLockIndicator::hide()
-{
-    QToolButton::hide();
-    parentWidget()->setStyleSheet(cleanInputStyle);
 }
 
 void CapsLockIndicator::updateIndicator()
@@ -48,7 +20,7 @@ void CapsLockIndicator::updateIndicator()
 #endif
 
     if (caps)
-        show();
+        parent->addAction(this, QLineEdit::TrailingPosition);
     else
-        hide();
+        parent->removeAction(this);
 }

src/widget/capslockindicator.h

@@ -1,21 +1,16 @@
 #ifndef CAPSLOCKINDICATOR_H
 #define CAPSLOCKINDICATOR_H
 
-#include <QToolButton>
+#include <QAction>
+#include <QLineEdit>
 
-class CapsLockIndicator : QToolButton
+class CapsLockIndicator : QAction
 {
 public:
-    CapsLockIndicator(QWidget *widget);
+    CapsLockIndicator(QLineEdit *widget);
     void updateIndicator();
-    void updateSize();
 
 private:
-    void show();
-    void hide();
-
-private:
-    QString cleanInputStyle;
-    QSize inputSize;
+    QLineEdit *parent;
 };
 #endif // CAPSLOCKINDICATOR_H

src/widget/loginscreen.cpp

@@ -136,8 +136,6 @@ bool LoginScreen::event(QEvent* event)
 void LoginScreen::onNewProfilePageClicked()
 {
     ui->stackedWidget->setCurrentIndex(0);
-    capsIndicator->updateSize();
-    confimCapsIndicator->updateSize();
 }
 
 void LoginScreen::onLoginPageClicked()