[okular] [Bug 372339] New: Okular fails to compile with QT < 5.6 due to usage of new QT method QList::constFirst

[Tobias Deiminger]

https://bugs.kde.org/show_bug.cgi?id=372339

            Bug ID: 372339
           Summary: Okular fails to compile with QT < 5.6 due to usage of
                    new QT method QList::constFirst
           Product: okular
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: haxtibal at t-online.de
  Target Milestone: ---

Okular configures, but fails to compile if built with QT < 5.6. This is because
core/document.cpp:L3687 uses QList<int>::constFirst, which was introduced only
with Qt 5.6.

CMakeLists.txt says set(QT_REQUIRED_VERSION "5.2.0"), so it looks like it was
intended to support lower versions than QT 5.6.

Compiler error is:
~/okular/core/document.cpp: In member function ‘void
Okular::Document::editFormCombo(int, Okular::FormFieldChoice*, const QString&,
int, int, int)’:
~/okular/core/document.cpp:3687:59: error: ‘class QList<int>’ has no member
named ‘constFirst’
         prevText = form->choices()[form->currentChoices().constFirst()];

Found with okular master (ae6adf2390e36d15754133fdf9f9a16c7bce7680), QT 5.5.1
and a fresh KF5 from kdesrc-build.

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