Update Ubuntu VM to 18.04 and remove external kubuntu backports PPA
previously used to get Qt packages.
While we're at it, remove libglu1-mesa-dev package too. The external
repo for libunarr is still needed as Ubuntu 18.04 does not package
it yet (it is included in 20.04)
Before this commit starting a search when an empty folder or an empty
reading list was selected left all comics actions disabled. Fixes#213.
When search mode is exited, we always call either
YACReaderNavigationController::loadFolderInfo() or
YACReaderNavigationController::loadListInfo(). Both of them call
LibraryWindow::disableComicsActions(), so the enabled/disabled state of
the comics actions stays up-to-date at all times.
Currently these objects are created once at program startup and are
never destroyed. Printing debug messages in the models' destructors
confirms the leaks and proves that with this fix the objects are
destroyed at Library exit.
Qmake by default creates lots of unnecessary information during builds
which makes it hard to extract warnings and errors from the log.
Add the undocumented silent parameter to make it less talky.
When Back or Forward action was triggered, the toolbar title was not
updated to match the reselected entry.
I am calling LibraryWindow::setToolbarTitle() from
selectedIndexFromHistory() rather than loadIndexFromHistory(), because
the latter is also called from
YACReaderNavigationController::loadPreviousStatus(), which in turn is
called only from LibraryWindow::setSearchFilter() when the search line
text becomes empty. The toolbar title is already correct and does not
have to be updated in this case.
My code analysis and experiments have revealed that YACReader code never
creates YACReaderLibrarySourceContainer objects of type None. This type
could be removed altogether along with YACReaderLibrarySourceContainer's
default constructor, but for Q_DECLARE_METATYPE macro's requirement. So
YACReaderNavigationController::loadIndexFromHistory() now simply prints
an error message instead of introducing a failure condition by returning
false when the type is None.
finished() signal of both FoldersRemover and ComicsRemover was not
connected to their QThread's quit() slot. So the thread kept running
after the deletion completed. The QThread's parent is LibraryWindow.
Thus LibraryWindow's ~QObject() invokes the QThread's destructor.
As a result, when the user exited YACReader Library after deleting at
least one folder or comic, it printed the following FATAL message and
crashed at exit: "QThread: Destroyed while thread is still running".
Extract signal-slot connections between a remover and a QThread into
moveAndConnectRemoverToThread() to reduce code duplication.
Remove always true (thread != NULL) checks.
The function doesn't use data members or other member functions. It
could even be put into an unnamed namespace in the cpp file, but that
would require more changes and complicate turning it back into a member
function if need be in the future.
InfoComicsView constructor is the only function that connects to
FlowView's currentCoverChanged signal. Neither of the slots connected to
this signal handles the argument value index==-1. So when FlowView emits
this signal with index==-1, YACReaderLibrary crashes. Returning early
from either ComicsView::updateInfoForIndex() or
InfoComicsView::setCurrentIndex() when index==-1 is not sufficient - the
crash happens in the other slot then. Let us skip emitting the signal in
FlowView if index==-1 rather than return early from both slots.
Steps to reproduce 1:
1. Launch YACReaderLibrary version that matches the version of the
default library database. Alternatively, select a compatible library
after starting the application.
2. If InfoComicsView is not active, switch to it.
3. (optional) Switch to another comics view out of InfoComicsView.
4. Quit YACReaderLibrary. The application crashes during exit - after
the "YACReaderLibrary closed with exit code : 0" message is printed.
Steps to reproduce 2:
1. Launch a YACReaderLibrary version newer than the version of the
default library database.
2. Click the "No" button in the "Update needed" dialog that pops up.
3. Change between comics views until InfoComicsView becomes active. If
this view was active at the beginning, switch through all the views to
get back to it. At this point YACReaderLibrary crashes.
