Add missing accessors
Here's an initial list of properties that miss getters:
GdkAppLaunchContext::display
GdkDevice::input-source
GdkDevice::input-mode
GdkDevice::num-touches
GdkDevice::tool
GdkDeviceTool::axes
GdkDrag::content
GdkDrag::surface
GdkSurface::mapped
GdkSurface::autohide
GtkAppChooserDialog::gfile
GtkApplication::register-session
GtkApplication::screensaver-active
GtkAspectFrame::xalign
GtkAspectFrame::yalign
GtkAspectFrame::ratio
GtkAspectFrame::obey-child
GtkAssistant::use-header-bar
GtkAssistantPage::page-type
GtkAssistantPage::title
GtkAssistantPage::complete
GtkCalendar::year
GtkCalendar::month
GtkCalendar::day
GtkCellAreaContext::minimum-width
GtkCellAreaContext::natural-width
GtkCellAreaContext::minimum-height
GtkCellAreaContext::natural-height
GtkCellView::cell-area
GtkCellView::cell-area-context
GtkColorButton::use-alpha
GtkColorButton::rgba
GtkColorButton::show-editor
GtkColorChooserDialog::show-editor
GtkColorChooserWidget::show-editor
GtkComboBox::has-frame
GtkComboBox::popup-shown
GtkConstraintGuide::min-width
GtkConstraintGuide::min-height
GtkConstraintGuide::nat-width
GtkConstraintGuide::nat-height
GtkConstraintGuide::max-width
GtkConstraintGuide::max-height
GtkDialog::use-header-bar
GtkDropTarget::contains
GtkEntryCompletion::cell-area
GtkEntry::scroll-offset
GtkEntry::truncate-multiline
GtkEntry::invisible-char-set
GtkEntry::primary-icon-paintable
GtkEntry::secondary-icon-paintable
GtkEntry::primary-icon-name
GtkEntry::secondary-icon-name
GtkEntry::primary-icon-gicon
GtkEntry::secondary-icon-gicon
GtkEntry::primary-icon-storage-type
GtkEntry::secondary-icon-storage-type
GtkEntry::primary-icon-activatable
GtkEntry::secondary-icon-activatable
GtkEntry::primary-icon-sensitive
GtkEntry::secondary-icon-sensitive
GtkEntry::primary-icon-tooltip-text
GtkEntry::secondary-icon-tooltip-text
GtkEntry::primary-icon-tooltip-markup
GtkEntry::secondary-icon-tooltip-markup
GtkEntry::im-module
GtkEntry::show-emoji-icon
GtkEntry::enable-emoji-completion
GtkEventControllerKey::is-focus
GtkEventControllerKey::contains-focus
GtkEventControllerMotion::is-pointer
GtkEventControllerMotion::contains-pointer
GtkFileChooserWidget::search-mode
GtkFileChooserWidget::subtitle
GtkFilterListModel::has-filter
GtkFilterListModel::item-type
GtkFlattenListModel::item-type
GtkFlowBox::accept-unpaired-release
GtkFontChooserWidget::tweak-action
GtkFrame::label-xalign
GtkGesture::n-points
GtkHeaderBar::decoration-layout-set
GtkIconPaintable::is-symbolic
GtkIconView::cell-area
GtkIMContext::input-purpose
GtkIMContext::input-hints
GtkImage::file
GtkImage::resource
GtkImage::use-fallback
GtkLabel::cursor-position
GtkLabel::selection-bound
GtkListBox::accept-unpaired-release
GtkLockButton::text-lock
GtkLockButton::text-unlock
GtkLockButton::tooltip-lock
GtkLockButton::tooltip-unlock
GtkLockButton::tooltip-not-authorized
GtkMapListModel::has-map
GtkMapListModel::item-type
GtkMediaStream::has-audio
GtkMediaStream::has-video
GtkMessageDialog::message-type
GtkMessageDialog::text
GtkMessageDialog::use-markup
GtkMessageDialog::secondary-text
GtkMessageDialog::secondary-use-markup
GtkMountOperation::is-showing
GtkNotebook::enable-popup
GtkNotebookPage::tab-label
GtkNotebookPage::menu-label
GtkNotebookPage::position
GtkNotebookPage::tab-expand
GtkNotebookPage::tab-fill
GtkNotebookPage::reorderable
GtkNotebookPage::detachable
GtkNotebookPage::tab
GtkNotebookPage::menu
GtkPadController::action-group
GtkPadController::pad
GtkPaned::position-set
GtkPaned::min-position
GtkPaned::max-position
GtkPaned::resize-child1
GtkPaned::resize-child2
GtkPaned::shrink-child1
GtkPaned::shrink-child2
GtkPasswordEntry::placeholder-text
GtkPasswordEntry::activates-default
GtkPopover::default-widget
GtkPopoverMenu::visible-submenu
GtkPrintOperation::job-name
GtkPrintOperation::n-pages
GtkPrintOperation::current-page
GtkPrintOperation::use-full-page
GtkPrintOperation::track-print-status
GtkPrintOperation::unit
GtkPrintOperation::show-progress
GtkPrintOperation::allow-async
GtkPrintOperation::export-filename
GtkPrintOperation::custom-tab-label
GtkRecentManager::filename
GtkRecentManager::size
GtkScaleButton::icons
GtkScrolledWindow::hscrollbar-policy
GtkScrolledWindow::vscrollbar-policy
GtkScrolledWindow::window-placement
GtkSearchBar::search-mode-enabled
GtkSearchEntry::placeholder-text
GtkSearchEntry::activates-default
GtkShortcutsGroup::title
GtkShortcutsGroup::view
GtkShortcutsGroup::height
GtkShortcutsSection::title
GtkShortcutsSection::section-name
GtkShortcutsSection::view-name
GtkShortcutsSection::max-height
GtkShortcutsShortcut::accelerator
GtkShortcutsShortcut::icon
GtkShortcutsShortcut::icon-set
GtkShortcutsShortcut::title
GtkShortcutsShortcut::subtitle
GtkShortcutsShortcut::subtitle-set
GtkShortcutsShortcut::direction
GtkShortcutsShortcut::shortcut-type
GtkShortcutsShortcut::action-name
GtkShortcutsWindow::section-name
GtkShortcutsWindow::view-name
GtkSliceListModel::item-type
GtkSortListModel::has-sort
GtkSortListModel::item-type
GtkSpinButton::climb-rate
GtkSpinner::active
GtkStackPage::name
GtkStackPage::title
GtkStackPage::icon-name
GtkStackPage::needs-attention
GtkStackPage::visible
GtkTextBuffer::cursor-position
GtkTextBuffer::copy-target-list
GtkTextBuffer::paste-target-list
GtkText::invisible-char-set
GtkText::scroll-offset
GtkText::truncate-multiline
GtkText::im-module
GtkText::enable-emoji-completion
GtkText::propagate-text-width
GtkTextView::im-module
GtkTreeModelFilter::child-model
GtkTreeModelFilter::virtual-root
GtkTreeViewColumn::cell-area
GtkTreeView::enable-grid-lines
GtkVolumeButton::use-symbolic
GtkWidget::width-request
GtkWidget::height-request
GtkWidget::has-focus
GtkWidget::is-focus
GtkWidget::has-default
GtkWidget::margin
GtkWidget::expand
GtkWindow::default-width
GtkWindow::default-height
GtkWindow::is-active
GtkWindow::is-maximized
Here's an initial list of properties that miss setters:
GdkDevice::input-mode
GdkDevice::seat
GdkDrag::selected-action
GdkDrag::actions
GtkApplication::register-session
GtkAspectFrame::xalign
GtkAspectFrame::yalign
GtkAspectFrame::ratio
GtkAspectFrame::obey-child
GtkAssistantPage::page-type
GtkAssistantPage::title
GtkAssistantPage::complete
GtkCalendar::year
GtkCalendar::month
GtkCalendar::day
GtkColorButton::use-alpha
GtkColorButton::rgba
GtkColorButton::show-editor
GtkColorChooserDialog::show-editor
GtkColorChooserWidget::show-editor
GtkComboBox::has-frame
GtkConstraintGuide::min-width
GtkConstraintGuide::min-height
GtkConstraintGuide::nat-width
GtkConstraintGuide::nat-height
GtkConstraintGuide::max-width
GtkConstraintGuide::max-height
GtkEntry::truncate-multiline
GtkEntry::invisible-char-set
GtkEntry::primary-icon-paintable
GtkEntry::secondary-icon-paintable
GtkEntry::primary-icon-name
GtkEntry::secondary-icon-name
GtkEntry::primary-icon-gicon
GtkEntry::secondary-icon-gicon
GtkEntry::primary-icon-activatable
GtkEntry::secondary-icon-activatable
GtkEntry::primary-icon-sensitive
GtkEntry::secondary-icon-sensitive
GtkEntry::primary-icon-tooltip-text
GtkEntry::secondary-icon-tooltip-text
GtkEntry::primary-icon-tooltip-markup
GtkEntry::secondary-icon-tooltip-markup
GtkEntry::im-module
GtkEntry::show-emoji-icon
GtkEntry::enable-emoji-completion
GtkFileChooserWidget::search-mode
GtkFlowBox::accept-unpaired-release
GtkFrame::label-xalign
GtkHeaderBar::decoration-layout-set
GtkIMContext::input-purpose
GtkIMContext::input-hints
GtkImage::paintable
GtkImage::file
GtkImage::icon-name
GtkImage::gicon
GtkImage::resource
GtkImage::use-fallback
GtkListBox::accept-unpaired-release
GtkLockButton::text-lock
GtkLockButton::text-unlock
GtkLockButton::tooltip-lock
GtkLockButton::tooltip-unlock
GtkLockButton::tooltip-not-authorized
GtkMediaStream::prepared
GtkMediaStream::error
GtkMediaStream::has-audio
GtkMediaStream::has-video
GtkMessageDialog::message-type
GtkMessageDialog::text
GtkMessageDialog::use-markup
GtkMessageDialog::secondary-text
GtkMessageDialog::secondary-use-markup
GtkNativeDialog::visible
GtkNotebook::page
GtkNotebook::enable-popup
GtkNotebookPage::tab-label
GtkNotebookPage::menu-label
GtkNotebookPage::position
GtkNotebookPage::tab-expand
GtkNotebookPage::tab-fill
GtkNotebookPage::reorderable
GtkNotebookPage::detachable
GtkPaned::position-set
GtkPaned::resize-child1
GtkPaned::resize-child2
GtkPaned::shrink-child1
GtkPaned::shrink-child2
GtkPasswordEntry::placeholder-text
GtkPasswordEntry::activates-default
GtkPopoverMenu::visible-submenu
GtkScrolledWindow::hscrollbar-policy
GtkScrolledWindow::vscrollbar-policy
GtkScrolledWindow::window-placement
GtkSearchBar::search-mode-enabled
GtkSearchEntry::placeholder-text
GtkSearchEntry::activates-default
GtkShortcutsGroup::title
GtkShortcutsGroup::view
GtkShortcutsGroup::accel-size-group
GtkShortcutsGroup::title-size-group
GtkShortcutsSection::title
GtkShortcutsSection::section-name
GtkShortcutsSection::view-name
GtkShortcutsSection::max-height
GtkShortcutsShortcut::accelerator
GtkShortcutsShortcut::icon
GtkShortcutsShortcut::icon-set
GtkShortcutsShortcut::title
GtkShortcutsShortcut::subtitle
GtkShortcutsShortcut::subtitle-set
GtkShortcutsShortcut::accel-size-group
GtkShortcutsShortcut::title-size-group
GtkShortcutsShortcut::direction
GtkShortcutsShortcut::shortcut-type
GtkShortcutsShortcut::action-name
GtkShortcutsWindow::section-name
GtkShortcutsWindow::view-name
GtkSpinButton::climb-rate
GtkSpinner::active
GtkStackPage::title
GtkStackPage::icon-name
GtkStackPage::needs-attention
GtkStackPage::visible
GtkText::invisible-char-set
GtkText::truncate-multiline
GtkText::im-module
GtkText::enable-emoji-completion
GtkText::propagate-text-width
GtkTextView::im-module
GtkTreeView::enable-grid-lines
GtkVolumeButton::use-symbolic
GtkWidget::width-request
GtkWidget::height-request
GtkWidget::has-focus
GtkWidget::is-focus
GtkWidget::margin
GtkWidget::expand
GtkWindow::default-width
GtkWindow::default-height