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Commit bbec7225 authored by Ahmad Samir's avatar Ahmad Samir
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Prevent window "flashing" when closing the last session 

There are two scenarios when closing a window:
A) clicking the close button on the title bar (or Ctrl+Shift+Q):
~MainWindow()
~ViewManager()
~TabbedViewContainer()
~TerminalDisplay()
~Session()

B) closing the last session/tab in a window:
SessionController::sessionFinished()
~Session()
~TerminalDisplay()
~TabbedViewContainer()
~MainWindow()
~ViewManager()

the issue with the second case is that the TerminalDisplay is torn down
first, which exposes the TabbedViewContainer widget, the latter has the same
Qt::Window colour as the system colour scheme window background colour, if
you're using a dark terminal colour scheme and a light-coloured system colour
scheme, you could see some "flashing" when you close the last session with
e.g. Ctrl+D.

To fix this, in sessionFinished() check if TabbedViewContainer::count() is
1 (i.e. closing last tab/session), and emit the empty() signal in that case,
which is connected to MainwWindow::close(), then the order of...
parent 99b39594
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