Correctly support style sheet for toolbutton menus and arrows

QToolButton can show an arrow instead of an icon, and that arrow can, as
per the documentation, styled via the ::down/up/left/right-arrow pseudo
element. This was not working at all, as the implementation confused the
down-arrow with the menu arrow. Implement this correctly for all arrow
types.

A QToolButton can also have different ways to show a menu, either by
using a separate section of the button that can be clicked; this section
can be styled via ::menu-button and ::menu-arrow.
Or by instant or delayed menu popup when clicking the button itself, in
which case the button shows an indicator in the button itelf; that
indicator can be styled via the ::menu-indicator pseudo element.

The old implementation confused the various options, and the name of the
PseudeoElement_ToolButonDownArrow didn't help with that. So rename that
element to PseudoElement_ToolButtonMenuIndicator, and render it when
there is no separate drop down.

Fixes: QTBUG-27640
Pick-to: 6.1 6.2
Change-Id: Ia142a5d7498fa717e70f4e5382305e305b29effa
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

0 files changed, 0 insertions, 0 deletions