[umbrello] [Bug 447661] Diagram objects moved to inside enclosing package become invisible

https://bugs.kde.org/show_bug.cgi?id=447661

--- Comment #1 from Oliver Kellogg <[email protected]> ---
Git commit 8f410485cfcc75a4fe452708d8b1aa009ae35f50 by Oliver Kellogg.
Committed on 29/12/2021 at 21:51.
Pushed by okellogg into branch 'master'.

Fix "Diagram objects moved to inside enclosing package become invisible"

umbrello/umlwidgets/widget_utils.{h,cpp}
- New function ensureNestedVisible prevents nested widget(s) located
  inside the area of a larger widget from disappearing.
  This is achieved by increasing the Z value on the contained widgets.

umbrello/toolbarstate.cpp
- In function mouseRelease add debug messages in the branches of the
  if-chain to ease tracing of events.
- In function mouseReleaseEmpty, if m_currentWidget is non null then
  call Widget_Utils::ensureNestedVisible with arguments m_currentWidget
  and m_pUMLScene->widgetList().

umbrello/umlwidgets/toolbarstateonewidget.cpp
- Split if-statement testing m_pMouseEvent->button() and currentWidget()
  into two separate if-statements.
  Return immediately if m_pMouseEvent->button() is not Qt::LeftButton.
- Add local UMLWidget *currWgt as shorthand for currentWidget().
- Call Widget_Utils::ensureNestedVisible with arguments currWgt and
  m_pUMLScene->widgetList() before executing the second part of the
  split if-statement (see above).

umbrello/umlwidgets/umlwidget.{h,cpp}
- New function isLocatedIn(const UMLWidget *other) returns true if
  `this' is located in the bounding rectangle of `other'.

umbrello/umlwidgets/umlwidget.cpp
- In function mouseReleaseEvent :
  - In if-statement testing (!m_moved && !m_resized), if neither
      (!m_shiftPressed && (m_scene->selectedCount() > 1))
    nor
      !isSelected()
    evaluates to true then call
    Widget_Utils::ensureNestedVisible(this, umlScene()->widgetList()).
  - In else-part of the if-statement, if m_moved is true then
    - local UMLWidgetList selectedWidgets acts as shorthand for
      umlScene()->selectedWidgets();
    - in foreach-loop over selectedWidgets additionally call
      Widget_Utils::ensureNestedVisible with arguments `widget' and
      umlScene()->widgetList().
- In function setSelected add call to
  Widget_Utils::ensureNestedVisible(this, umlScene()->widgetList()).

M  +9    -1    umbrello/toolbarstate.cpp
M  +17   -8    umbrello/umlwidgets/toolbarstateonewidget.cpp
M  +50   -2    umbrello/umlwidgets/umlwidget.cpp
M  +2    -0    umbrello/umlwidgets/umlwidget.h
M  +21   -0    umbrello/umlwidgets/widget_utils.cpp
M  +3    -1    umbrello/umlwidgets/widget_utils.h

https://invent.kde.org/sdk/umbrello/commit/8f410485cfcc75a4fe452708d8b1aa009ae35f50

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